f

Modification of upper case Latin letter F, from Greek Ϝ (W, “Digamma”), from Phœnician 𐤅 (W, “waw”), the ultimate source being probably Egyptian.


MIA

I have visited more than half a dozen carrier training facilities, spent over 150 hours on jumpseats, piloted a Lockheed 1011 from MIA to LAX, visited numerous towers, rapcons, and centers, and discussed our commercial Air Transport System with everyone involved.

1975, John H. Reed, Transportation Safety Board, Safety Information (in English), page 30:

(international standards, aviation) IATA airport code for Miami International Airport, which serves Miami, Florida, United States.


i

Pronunciation of IPA [iː]

* (mathematics, imaginary number): abbreviation of imaginary
* (engineering, electric current): abbreviation of French intensité du courant first used by M. André-Marie Ampère
* (computer programming, generic index): abbreviation of index
* (linguistics): abbreviation of identity

v=ir (Ohm's Law)

(engineering, often in bold) The current flow in an electric circuit, frequently measured in amperes.

(mathematics, programming) A common variable name representing a generic index, especially in loops.


ACT

(international standards, aviation) IATA airport code for Waco Regional Airport, which serves Waco, Texas, United States.


CL

(aviation) the prefix for Canadair manufactured aircraft model numbers


IMF

(international standards, aviation) IATA airport code for Imphal International Airport, which serves Imphal, Manipur, India.


r

Pronunciation of IPA [rɑː, ɑrrɑː] with the sound [r]


e

Close-mid front unrounded vowel
e
e (mathematical constant

Pronunciation of IPA [eː]

Modification of capital letter E in uncial script, from Ancient Greek Ε (E, Epsilon).

1.2566e-6 = 1.2566 × 10⁻⁶

(sciences, computing) Symbol separating mantissa from the exponent in scientific notation.


ABM

(international standards, aviation) IATA airport code for Northern Peninsula Airport, which serves Bamaga, Queensland, Australia.


ABC

(international standards, aviation) IATA airport code for Albacete Airport, which serves Albacete, Castilla–La Mancha, Spain.


ADH

(international standards, aviation) IATA airport code for Aldan Airport, which serves Aldan, Sakha, Russia.


ADP

(international standards, aviation) IATA airport code for Ampara Airport, which serves Ampara, Eastern Province, Sri Lanka.


ADA

(international standards, aviation) IATA airport code for Adana Şakirpaşa Airport, which serves Adana, Turkey.


AAA

(international standards, aviation) IATA airport code for Anaa Airport, which serves Anaa, French Polynesia.


XXX

From the reduplication of X (“a placeholder for any letter or word”).
The currency code was adopted in October 1976 and officially introduced in 1978 with ISO 4217 by the International Organization for Standardization (ISO).

rdp

(computing) Used as a placeholder in source code to mark that some work still has to be done.


pu

electrical engineering
electrical engineering


Derives from overset Io, an abbreviation of either interiectiō (“interjection”) or the interjection iō (“hey!”), placed at the end of an exclamation to mark it as such. It expresses admiratio (“awe, wonderment”) in the clause.

programming language
programming language

(computing, in many programming languages) A Boolean negation, the not operator, serving to invert the truth value of what follows.

(computing, e-mail) Formerly used as a separator between hostnames in an e-mail address for the purpose of routing a message (called bang path notation).

(computing, IRC) Used as a separator between a user's nickname and ident.


Tenth century “West Arabic” variation of the Nepali form of Hindu-Arabic numeral ٠ (compare Devanāgarī script ० (0)), adopted for use with the Latin script in Europe. See 0 § History for more.

0̸

slashed zero, available only as a combination of Unicode characters, variation selector or through font features

f : Bᵏ → B : B = {0, 1}

A&B&C=0 → A=0 || B=0 || C=0

(mathematics, computer science) A Boolean or truth value corresponding to false.

(computing) Indicates that the number that follows is in octal.

select currency expressions containing ‘0’


Tenth century “West Arabic” variation of the Nepali form of Hindu-Arabic numerals (compare Devanagari script १ (1, “éka”)), possibly influenced by Roman numeral Ⅰ, both ultimately from using a single stroke to represent the number one. See 1 § As a digit on WikipediaWikipedia for more.

(computer science) Bit state corresponding to binary digit 1, or on or true.


A stylized form of Latin et (“and”). Romans used such symbols (ligatures) from at least the first century C.E., but the character may not have acquired its present form until the advent of calligraphy in the Middle Ages. Compare ⁊ and +, of same meaning and similar derivation.

Ꜳꜳ Ææ ᴁᴭ Ǽǽ Ǣǣ Ꜵꜵ Åå Ꜷꜷ Ꜹꜹ Ꜻꜻ Ꜽꜽ ct ȸ Ǳǲǳ Ǆǅǆ ᴂᵆ ᴔ & ﬀ ﬁ ﬃ ﬂ ﬄ ℔ Ĳĳ Ǉǈǉ Ỻỻ Ŋŋ Ǌǋǌ Œœ ɶ Ꝏꝏ Ȣȣᴕ ȹ ẞß ﬅﬆ ᵫ Ůů Ww Ꝡꝡ

(programming) Used in some programming languages for different purposes.

(networking) In a URL, separates each field-value pair of a query string .


ADO

(international standards, aviation) IATA airport code for Andamooka Airport, which serves Andamooka, South Australia, Australia.


ADC

(international standards, aviation) IATA airport code for Andakombe Airport, which serves Andakombe, Eastern Highlands, Papua New Guinea.


ADN

(international standards, aviation) IATA airport code for Andes Airport, which serves Andes, Antioquia, Colombia.


DAC

(international standards, aviation) IATA airport code for Hazrat Shahjalal International Airport, which serves Dhaka, Bangladesh.


AAC

(international standards, aviation) IATA airport code for El Arish International Airport, which serves Arish, North Sinai, Egypt.


ADD

(international standards, aviation) IATA airport code for Addis Ababa Bole International Airport, which serves Addis Ababa, Ethiopia.


Derives from the punctus versus.
The Italian printer Aldus Manutius established the practice of using the semicolon mark to separate words of opposed meaning, and to indicate interdependent statements. The earliest, general use of the semicolon in English was in 1591.

<?php echo '
Hello World
'; ?>

(programming) Marks the end of a statement in some programming languages.


η

(engineering) Efficiency in engineering.


NP

(computer science) The class of problems whose solutions can be checked in polynomial time.


$ appears to have evolved circa 1775 in the United States from a common abbreviation for pesos, also known as piastres or pieces of eight, a P/raised-S ligature P^S. It was used in the US before the adoption of the dollar in 1785.
The "computing" sense is the result of homophony between English cache and cash, dollars being a form of cash.

How to provide additional D$ bandwidth?

2010, CIS501 lecture notes (in English), University of Pennsylvania:


(programming) Prefix indicating a variable in some languages, such as Perl, PHP, or shell scripts.


Use as a multiplication sign is usually attributed to English mathematician William Oughtred.

{1,2} × {3,4} = {(1,3),(1,4),(2,3),(2,4)}

(set theory, category theory) Cartesian product, categorical product.


BOM

(international standards, aviation) IATA airport code for Chhatrapati Shivaji Maharaj International Airport, which serves Mumbai, India.


(computing) Used as a multiplication symbol; ×.

In the language defined by AB*A, each string starts with an A, ends with a distinct A, and between them has zero or more Bs.

(algebra, computer science) Free monoid or Kleene star.


trans*

(chiefly computing) Uses especially in computing.

Used as a wildcard to denote zero or more characters.

(Internet) Used to indicate a field of a form that must be filled out.

I'm our of time. / *out

(Internet slang) Used before or after a word to show a correction has been made, chiefly by the same participant.


A cursive variation of ᾱ or ᾱᾱ, the abbreviation of Greek ἀνά (aná) used in recipes and prescriptions with the meaning "of each", and later extended to accounting. (Other explanations have that it is ā, an abbreviation of Latin ad (“to”), or French à (“to”).)

My e-mail address is psychonaut@example.com.

(computing) The symbol used as a separator between a username and a domain name in an e-mail address ("at" the domain name).

(computing, IRC) The most common choice of configurable prefix symbol to identify a channel operator.


TLC

(international standards, aviation) IATA airport code for Toluca International Airport, which serves Toluca, State of Mexico, Mexico.


The lunar crescent is an ancient symbol for the moon.
Its orientation varies between increscent and decrescent.

rarely 🌙. In the medieval Marcianus graecus 299 manuscript

graphical user interface
graphical user interface

(graphical user interface, signage) Do not disturb; quiet.

(graphical user interface, computing) Sleep mode; off.

(graphical user interface) Night mode: a colour scheme with light text on a dark background.


MGM

(international standards, aviation) IATA airport code for Montgomery Regional Airport, which serves Montgomery, Alabama, United States.


SAT

Abbreviation of Boolean satisfiability problem.

abbrev

(computing theory) The decision problem of deciding whether a given Boolean formula has an assignment of Boolean values to its variables that makes it true. A famous NP-complete problem.


(computing) A common prefix for escape characters.

Coordinate term: /

(computing) A pathname component separator in some operating systems, predominantly Microsoft ones.


exclusive disjunction
exclusive disjunction

(programming) Bitwise exclusive disjunction.

Press ^F to find text in your document.

(computing, as part of a keyboard shortcut) Control key.

^W = end of control block

control character
control character#English

(computing) Indicates an ASCII control character in caret notation.


From ᵒ/c, from Nᵒ/c, an abbreviation of Italian numero per cento (“number per hundred”). For the extension to Astraea is derived from the shift-5 key on the keyboard for asteroid (5).

der

(computing) Used as a wildcard, usually in SQL, to stand for zero or more characters.

(computing, programming) Used as the symbol for the modulus, placed between two numbers, to get the remainder of the division of those numbers.


(computing) user's home directory in Unix-like operating systems


WRT

(international standards, aviation) IATA airport code for Warton Aerodrome, which serves Warton, Lancashire, England.


ABN

(international standards, aviation) IATA airport code for Albina Airstrip, which serves Albina, Suriname.


DNS

(international standards, aviation) IATA airport code for Denison Municipal Airport, which serves Denison, Iowa, United States.


lb

(computer science): From New Latin logarithmus binarii (“binary logarithm”).

lb(x)= log ₂(x). lb(2)=1

(computer science) Binary logarithm; logarithm to the base 2.


MCO

(international standards, aviation) IATA airport code for Orlando International Airport, which serves Orlando, Florida, USA.


JFK

(international standards, aviation) IATA airport code for John F. Kennedy International Airport, which serves New York City, United States.


ADT

(international standards, aviation) IATA airport code for Ada Municipal Airport, which serves Ada, Oklahoma, United States.


SCO

(international standards, aviation) IATA airport code for San Francisco International Airport, which serves San Francisco, California, United States of America.


ACK

(international standards, aviation) IATA airport code for Nantucket Memorial Airport, which serves Nantucket, Massachusetts, United States.


Bd

(computing) Symbol for baud, a unit of data transfer rate.


Bi

(electricity, physics) biot (“abampere”)


Π

arithmetical hierarchy
arithmetical hierarchy

polynomial hierarchy
polynomial hierarchy

universal quantifier
universal quantifier

(mathematics, logic, computer science) A class (in some hierarchy of formulae, like the arithmetical hierarchy or polynomial hierarchy) of those formulae whose outermost quantifiers are universal quantifiers.


F

From the Etruscan letter 𐌅 (v, “ve”), from the Ancient Greek letter Ϝ (W, “digamma”), derived from the Phoenician letter 𐤅 (w, “waw”), from the Egyptian hieroglyph 𓏲.


peru

Clipping of Peruvian brown. Added to X11's rgb.txt file on October 26 1989.

peru:

(computer science) The X11 color name of RGB hexadecimal value #CD853F.


L

From the Etruscan letter 𐌋 (l, “el”), from the Ancient Greek letter Λ (L, “lambda”), derived from the Phoenician letter 𐤋 (l, “lamed”), from the Egyptian hieroglyph 𓌅.

(computer science) Deterministic logarithmic space


D

* (chemistry, deuterium): abbreviation of deuterium
* (computing, hexadecimal 13): From its position as the thirteenth element of the series {1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F}
* (Germany): abbreviation of German word Deutschland (“Germany”)

(computing) Hexadecimal symbol for thirteen.


ABA

(international standards, aviation) IATA airport code for Abakan International Airport, which serves Abakan, Khakassia, Russia.


E

From the Etruscan letter 𐌄 (e, “e”), from the Ancient Greek letter Ε (E, “epsilon”), derived from the Phoenician letter 𐤄 (h, “he”), from the Egyptian hieroglyph 𓀠.

2E5 = 2 × 10⁵

(sciences, computing) Symbol separating mantissa from the exponent in scientific notation.


ZAG

(international standards, aviation) IATA airport code for Zagreb Franjo Tuđman Airport, which serves Zagreb, Croatia.


C

* (element symbol, carbon): abbreviation
* (metrology, coulomb): abbreviation
* (computing, hexadecimal 12): From its position as the twelfth element of the series {1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F}

(computing, hexadecimal) The digit for 12.


P

From the Etruscan letter 𐌐 (p, “pe”), from the Ancient Greek letter Π (P, “pi”), derived from the Phoenician letter 𐤐 (p, “pe”), from the Egyptian hieroglyph 𓂋.

(computer science) class of problems solvable in polynomial time


H

From the Etruscan letter 𐌇 (h, he), from the Ancient Greek letter Η (Ē, eta), derived from the Phoenician letter 𐤇 (ḥ, het), from the Egyptian hieroglyph 𓈈 or maybe 𓉗.


Y

A late borrowing from the Ancient Greek letter Υ (U, “ypsilon”), first used to write Greek loanwords in Latin, derived from the Phoenician letter 𐤅 (w, “waw”), from the Egyptian hieroglyph 𓏲. Doublet of U and V.

reservation booking designator
reservation booking designator

(travel, aviation) The reservation booking designator for the highest level of economy air fare.

(mathematics, computer science) A Fixed-point combinator; especially Haskell Curry's combinator defined as λ f.(λ x.f (x x)) (λx.f (x x))


Z

From the Etruscan letter 𐌆 (z, “ze”), from the Ancient Greek letter Ζ (Z, “zeta”), derived from the Phoenician letter 𐤆 (z, “zayin”), from the Egyptian hieroglyph 𓏭.

(physics, computer graphics) the depth dimension in a 3D environment


LAX

(international standards, aviation) IATA airport code for Los Angeles International Airport, which serves Los Angeles, California, United States.


S

From the Etruscan letter 𐌔 (s, “es”), from the Ancient Greek letter Σ (S, “sigma”), derived from the Phoenician letter 𐤔 (š, “šin”), from the Egyptian hieroglyph 𓌒.

(mathematics, computer science) The S ("substitution") combinator, defined as Sxyz = xz(yz), used in SKI calculus


POA

(international standards, aviation) IATA airport code for Salgado Filho Porto Alegre International Airport, which serves Porto Alegre, Rio Grande do Sul, Brazil.


ADR

(international standards, aviation) IATA airport code for Robert F. Swinnie Airport, which serves Andrews, South Carolina, United States.


ADL

(international standards, aviation) IATA airport code for Adelaide Airport, which serves Adelaide, South Australia, Australia.


AAL

(international standards, aviation) IATA airport code for Aalborg Airport, which serves Aalborg, Denmark.


PMI

(international standards, aviation) IATA airport code for Palma de Mallorca Airport, which serves Mallorca, Spain.


AAP

(international standards, aviation) IATA airport code for Aji Pangeran Tumenggung Pranoto International Airport, which serves Samarinda, East Kalimantan, Indonesia.


CFN

(international standards, aviation) IATA airport code for Donegal Airport, which serves Carrickfinn, Ireland.


ACC

(international standards, aviation) IATA airport code for Kotoka International Airport, which serves Accra, Ghana.


ABS

(international standards, aviation) IATA airport code for Abu Simbel Airport, which serves Abu Simbel, Aswan, Egypt.


ACS

(international standards, aviation) IATA airport code for Achinsk Airport, which serves Achinsk, Krasnoyarsk Krai, Russia.


ACE

(international standards, aviation) IATA airport code for César Manrique-Lanzarote Airport, which serves Lanzarote, Las Palmas.


TRV

(international standards, aviation) IATA airport code for Thiruvananthapuram International Airport, which serves Thiruvananthapuram, Kerala, India.


I

From the Etruscan letter 𐌉 (i), from the Ancient Greek letter Ι (I, iota), derived from the Phoenician letter 𐤉 (y, yod), from the Egyptian hieroglyph 𓂝.

(physics, electronics) Electrical current.


ANG

(computing) Animated Network Graphics; an alternate name for APNG (Animated Portable Network Graphics)


STN

(international standards, aviation) IATA airport code for London Stansted Airport, which serves London, United Kingdom.


SVG

(international standards, aviation) IATA airport code for Stavanger Airport, Sola, which serves Stavanger, Norway.


AMS

(international standards, aviation) IATA airport code for Amsterdam Airport Schiphol, which serves Amsterdam, Netherlands.


IST

(international standards, aviation) IATA airport code for Istanbul Airport, which serves Istanbul, Turkey.


AAS

(international standards, aviation) IATA airport code for Apalapsili Airport, which serves Apalapsili, Papua, Indonesia.


RFD

(international standards, aviation) IATA airport code for Chicago Rockford International Airport, which serves Chicago, Illinois, United States.


ADW

(international standards, aviation) IATA airport code for Andrews Air Force Base in Camp Springs, Maryland, United States.


SAW

(international standards, aviation) IATA airport code for Istanbul Sabiha Gökçen International Airport, which serves Istanbul, Turkey.


IAD

(international standards, aviation) IATA airport code for Washington Dulles International Airport, which serves Washington, D.C., United States.


FOR

(international standards, aviation) IATA airport code for Fortaleza Airport, which serves Fortaleza, Ceará, Brazil.


AAR

(international standards, aviation) IATA airport code for Aarhus Airport, which serves Aarhus, Denmark.


There are two primary theories of the origin of the question mark. One is that ⟨?⟩ descends from the punctus interrogativus ⟨⹔⟩, which instructed the reader (or singer) to raise the pitch of their voice while coming to a stop.
Another theory is that it derives from overset Qo, an abbreviation of Latin quaestio (“question”), placed at the end of a question to mark it as such, and analogous to the derivation of ⟨!⟩.
There are no documented intermediary forms to support one theory over the other.

(programming) A wildcard for one character in query language.

(programming) The ternary operator in some programming languages.

(networking) In a URL, begins a query string (a series of data formatted as field-value pairs).


SEA

(international standards, aviation) IATA airport code for Seattle–Tacoma International Airport, which serves Seattle, Washington, United States of America.


ACI

(international standards, aviation) IATA airport code for Alderney Airport, which serves Alderney, Channel Islands.


(computing, dated) ISO 2047 symbol for Line Feed.


ADB

(international standards, aviation) IATA airport code for İzmir Adnan Menderes Airport, which serves İzmir, Turkey.


In the modern sense as the equal sign, first attested in The Whetstone of Witte (1557) by Welsh mathematician Robert Recorde, in which the two parallel lines expressed equality, because, as Recorde wrote, "bicauſe noe .2. thynges, can be moare equalle" ("because no two things can be more equal").

abbr

The whetstone of witte, whiche is the seconde parte of Arithmetike: containyng thextraction of Rootes: The Coßike practise, with the rule of Equation: and the woorkes of Surde Nombers

(depending on context)

The statement f(x)=O(log²x) means that as x gets arbitrarily large, f(x) will never grow faster than some constant multiple of log²x.

(mathematics) The equal sign. It asserts that two quantities or expressions have the same value.

(mathematics, computing theory, abuse of notation, with big O notation) Is. Used to state the relation that the growth rate of the expression on the left side of the sign is bounded or limited by that of the expression on the right.

$price=18.95 (this causes $price to be 18.95 from now on)

(programming) The assignment operator. It assigns a value to a variable.

(programming) An operator that compares if two values are equal. In some languages, == is used instead.


(international standards, aviation) IATA airport code for Nadi International Airport, which serves Nadi, Fiji.


AAD

(international standards, aviation) IATA airport code for Adado Airport, which serves Adado, Galmudug, Somalia.


x

Originates in given multiples of the speeds specified in the original CD and DVD standards, then, by reason of the actual unit being without name but just implied by the multiplication sign, reinterpreted as or used as if a unit, considering also that data transfer speed is variable, so that now, bolstered by stylization of the sign in the marketing of manufacturers, either spelling, with the multiplication sign or with the ex borrowed from the iconic mathematical variable sign, seems correct.

(computing) A unit of transfer rate of CD drives, equal to 150 KiB per second.

(computing) A unit of transfer rate of DVD drives, equal 1.32 MiB per second.


ang

(computing) Alternative letter-case form of ANG.


STR

(international standards, aviation) IATA airport code for Stuttgart Airport, which serves Stuttgart, Baden-Württemberg, Germany.


PAR

(international standards, aviation) IATA metropolitan area code for Paris, France, collectively referring to the airport system of Charles de Gaulle Airport, Orly Airport, Paris–Le Bourget Airport, Beauvais–Tillé Airport, Pontoise – Cormeilles Aerodrome, Châlons Vatry Airport and Vélizy – Villacoublay Air Base.


(computing, dated) ISO 2047 symbol for Shift Out


ABH

(international standards, aviation) IATA airport code for Alpha Airport, which serves Alpha, Queensland, Australia.


ACL

(international standards, aviation) IATA airport code for Aguaclara Airport, which serves Aguaclara, Colombia.


KUL

(international standards, aviation) IATA airport code for Kuala Lumpur International Airport, which serves Kuala Lumpur, Malaysia.


(programming) Represents null coalescing operator or an operator with similar functions in some programming languages. Returns the second operand if the first returns null or is unset, with variations depending on the programming language.


sinc

(engineering) A symbol of the sinc function. (f(x) = sin(πx)/(πx))


used when omitting a section in quoted text

Save as...

Find and replace...

(computing) Indicates that a computer command will request further information, typically by opening a dialog box.


DFW

(international standards, aviation) IATA airport code for Dallas/Fort Worth International Airport, which serves Dallas–Fort Worth–Arlington, Texas, United States.


DIU

(international standards, aviation) IATA airport code for Diu Airport, which serves Diu, Dadra and Nagar Haveli and Daman and Diu, India.


head

+ (English symbol name plus sign or plus)

plus sign (English name symbol)
plus (English name symbol)

antonym(s) of “addition or positiveness”

From a ligature of Latin et (“and”). Compare & and ⁊ of same meaning.

"My name is " + name + ". I am " + age + " years old."

(programming) A string concatenation in some programming languages (that might be ambiguous with an additive operation).


Press Ctrl+C to copy!

(computing) When placed between key names, indicates that they should be pressed simultaneously.


antonym(s) of “all except relative complement”

There are many theories regarding the origin of the minus sign. According to one theory, it originates from a handwriting form of the letter m (for minus) that came to resemble a horizontal bar, Another theory traces it back to a hieratic sign.


○ and ◌⃝ for uses of a letter inside a circle


ld

Abbreviation of Latin logarithmus dualis.

log ₂(x)=ld(x). ld(2)=1

(computer science) binary logarithm; logarithm to the base 2


lg

(mathematics and computer science): Abbreviation of Latin logarithmus generalis.

lg (x)= log ₂(x). lg (2)=1

(computer science) binary logarithm; logarithm to the base 2.


(computing, dated) ISO 2047 symbol for Space


(computing, dated) ISO 2047 symbol for Escape


ACA

(international standards, aviation) IATA airport code for General Juan N. Álvarez International Airport, which serves Acapulco, Guerrero, Mexico.


ABD

(international standards, aviation) IATA airport code for Abadan International Airport, which serves Abadan, Khuzestan, Iran.


ABR

(international standards, aviation) IATA airport code for Aberdeen Regional Airport, which serves Aberdeen, South Dakota, United States.


(English name slash or stroke or solidus)

slash (English name)
stroke (English name)
solidus (English name)

The various uses of the present symbol derive from several sources. The medieval virgule (Latin virgula) was an oblique or vertical line that served as a comma, period, and caesura mark and is still used in literary contexts to mark line breaks in verse. (This mark separately developed as the comma ⟨,⟩ and caesura mark ⟨‖⟩ and some senses of the vertical bar ⟨|⟩.) The shilling mark (Latin solidus) was variously written s. or as the long s ſ. This eventually developed into a single unpunctuated slash; its use to separate shillings from pence was sometimes generalized to any currency division. Most mathematical senses derived from the earlier horizontal fraction bar (as in 12, usually attributed to Arabic mathematician al-Hassar), rewritten with a slash by the 18th century to permit fractions to be written on a single line. As a separator and conjunction, it represents an oblique form of the dash ⟨–⟩ or hyphen ⟨-⟩. Its use to mark supposed actions derives from command formatting in online chat forums, while its use to comment on preceding text derives from its use in some programming languages to form closing tags. Its present British name stroke derives from its use in telegraphy; its present American name slash gained wide currency from its use in computing.

QUIT? Y/N

(computing) Used to separate commands or keys that can be typed, usually in a command prompt.

I support him completely /sarcasm

(informal, programming, text messaging) Denotes a given attribute of the preceding content in the manner of a closing tag. See tone tag.

(computing) Used to separate the nested directory levels in a file or URL path.

operating system
operating system#English

(when used in isolation) The root path of a Unix or Unix-like operating system.


(computing, dated) The ISO 2047 symbol for Start of Text.


SHE

(international standards, aviation) IATA airport code for Shenyang Taoxian International Airport, which serves Shenyang,, Liaoning, China.


Suppose that G ≅ H. Then there exists an isomorphism f, say, from G to H.

2011 May 5, Clive Reis, Abstract Algebra: An Introduction To Groups, Rings And Fields (in English), World Scientific Publishing Company, →ISBN, page 137:

(algebra, category theory, logic) Isomorphic to.


DCA

(international standards, aviation) IATA airport code for Ronald Reagan Washington National Airport, which serves Washington, D.C., United States.


BOE

(international standards, aviation) IATA airport code for Boundji Airport, which serves Boundji, Republic of the Congo.


TAN

(international standards, aviation) IATA airport code for Taunton Municipal Airport, which serves Taunton, Massachusetts, United States.


LOS

(international standards, aviation) IATA airport code for Murtala Muhammed International Airport, which serves Lagos, Nigeria.


BCN

(international standards, aviation) IATA airport code for Barcelona El Prat Airport, which serves Barcelona, Spain.


GRO

(international standards, aviation) IATA airport code for Girona–Costa Brava Airport, which serves Girona, Catalonia, Spain.


(programming) Decrement by 1 in certain programming languages such as C and Java.

if pizza == "plain cheese" -- Checks if pizza is "plain cheese".

SELECT id, name, birth_date -- Selects fields from a table.

programming language
programming language#English

(programming) Starts a single-line comment in some programming languages, including Ada, Haskell, and Lua, as well as some query languages.


^W

(computing) The ASCII control character end of transmission block in caret notation.


^H

(computing) The ASCII control character backspace in caret notation.


kS

(metrology, electronics) Symbol for the kilosample, a unit equal to 10³ samples.


CAN

(international standards, aviation) IATA airport code for Guangzhou Baiyun International Airport, which serves Guangzhou, Guangdong, China.


JST

(international standards, aviation) IATA airport code for Johnstown–Cambria County Airport, which serves Johnstown, Pennsylvania, United States.


ACV

(international standards, aviation) IATA airport code for Arcata–Eureka Airport, which serves Humboldt County, California, United States.


s.l.

Abbreviation of sine loco (“without place”).

abbreviation of

(bibliography, proscribed) no place of publication given


LIS

(international standards, aviation) IATA airport code for Lisbon International Airport, which serves Lisbon, Portugal.


SHJ

(international standards, aviation) IATA airport code for Sharjah International Airport, which serves Sharjah, Dubai, United Arab Emirates.


FAO

(international standards, aviation) IATA airport code for Faro Airport, which serves Faro, Algarve, Portugal.


(programming) Alternative form of >> (right shift operator).


(programming) Alternative form of << (left shift operator).


Introduced by the B programming language, which also used "!" for boolean negation, and inherited by its successor C. Later adopted more widely.

(programming) In some programming languages, an operator that compares two values for inequality, yielding a true result if they differ.


(category theory) The unique object in a category with a single object.


(mathematics, category theory) n-ary coproduct


CAI

(international standards, aviation) IATA airport code for Cairo International Airport, which serves Cairo, Egypt.


ADQ

(international standards, aviation) IATA airport code for Kodiak Benny Benson State Airport, which serves Kodiak, Alaska, United States.


ABO

(international standards, aviation) IATA airport code for Aboisso Airport, which serves Aboisso, Ivory Coast.


head

✓ (English symbol name tick or checkmark or check)

tick (English name symbol)
checkmark (English name symbol)
check (English name symbol)

(computing, dated) ISO 2047 symbol for Acknowledge.


(programming) Alternative form of >>> (right shift operator).


(computing, dated) ISO 2047 symbol for Horizontal Tabulation


(computing, dated) ISO 2047 symbol for Carriage Return


(programming) Alternative form of <<< (left shift operator).


AAM

(international standards, aviation) IATA airport code for Mala Mala Airport, which serves Mala Mala Game Reserve, Mpumalanga, South Africa.


(computing) cloud technology (computing, storage)


(computing) The object replacement character, sometimes used to represent an embedded object in a document when it is converted to plain text.


Mordecai: He's not even here. He's playing basketball. […] You snooze, you lose. I'm sure this will only take a second anyways.

2011, "Slam Dunk", season 3, episode 7 of Regular Show Rigby: You can't even [create a website] right now, anyway. Muscle Man has the computer for the whole day. […]

[Mordecai turns on the computer, and an hourglass appears on the screen while the computer is booting.]

(graphical user interface) Indicates that the current application is busy performing an operation.


In mathematics, first introduced by Nicolas Bourbaki in their treatise Éléments de mathématique.

(mathematics, computer science) Used to mark an especially difficult passage or proof in a textbook.

Bourbaki dangerous bend symbol
Nicolas Bourbaki
Éléments de mathématique


★ (English symbol name star or five-pointed star)

star (English name symbol)
five-pointed star (English name symbol)

Likely from Egyptian 𓇼 (“determinative for stars and constellations”) (image: dwA). However, around the same time in Mesopotamia, non-cuneiform depictions of a star with eight- or six-points are attested; compare Sumerian 𒀭, a cuneiform character descended from such drawings.

der

(graphical user interface) Favourite (“to add to one's list of favourite items on a website or service that allows users to compile such lists”); favourites.

Indicates something or someone noteworthy, important, special or significant.

(graphical user interface) Bookmark (“to create a record of the address of a file or Internet page, serving as a shortcut to it”); bookmarks; save; saved items.


(computing) symbol for the backspace key.


(computing) Command key on Apple Macintosh computer keyboards.


(computing) Used as a visual representation of the control character “start of heading”.


(computing) Used as a visual representation of the control character "enquiry".


(computing) Used as a visual representation of the control character "end of text".


(computing) Used as a visual representation of the bell character.


(computing) Used as a visual representation of the control character “horizontal tabulation”.


(computing) Used as a visual representation of the control character “backspace”.


(computing) Used as a visual representation of the control character “line feed”.


(computing) Used as a visual representation of the control character “acknowledge”.


(computing) Used as a visual representation of the control character "start of text".


(computing) Used as a visual representation of the control character “form feed”.


(computing) Used as a visual representation of the control character “end of transmission”.


(computing) Used as a visual representation of the control character "shift in".


(computing) Used as a visual representation of the control character “vertical tabulation”.


(computing) Used as a visual representation of the control character "shift out".


(computing) Used as a visual representation of the control character "carriage return".


(computing) Used as a visual representation of the control character "data link escape".


(computing) Used as a visual representation of the control character "device control four".


(computing) Used as a visual representation of the control character "end of transmission block".


(computing) Used as a visual representation of the control character "substitute".


(computing) Used as a visual representation of the control character "file separator".


(computing) Used as a visual representation of the control character "cancel".


(computing) Used as a visual representation of the control character "record separator".


(computing) Used as a visual representation of the control character "unit separator".


(computing) Used as a visual representation of the control character "negative acknowledge".


(computing) Used as a visual representation of the control character "end of medium".


(computing) Used as a visual representation of the control character "newline".


(computing) Used as a visual representation of the control character "delete".


(computing) Used as a visual representation of the control character "group separator".


(computing, dated) ISO 2047 symbol for Substitute Character


(computing, typography) An explicit space, as opposed to a tab character, or nothing at all.


(computing) Used as a visual representation of the control character "space".


(computing) Used as a visual representation of the control character "synchronous idle".


(computing) Used as a visual representation of the control character "device control one".


(computing) Used as a visual representation of the control character "escape".


(computing, dated) ISO 2047 symbol for Delete


(computing, dated) ISO 2047 symbol for Negative Acknowledge


(computing, dated) ISO 2047 symbol for End of Transmission


(mathematics, category theory, text-style only) morphism or a function, pointing from the domain to the codomain

Go to File → Save As → CSV file → OK.

(computing, text-style only) Indicates a series of steps to achieve a task in software.

(computing) The right-arrow key on a computer keyboard, used for navigation and various keyboard commands.


(computing) Used as a visual representation of the control character "device control three".


(computing) Used as a visual representation of the control character "device control two".


(computing, dated) ISO 2047 symbol for Synchronization


(mathematics, computer science) Kleene plus


MMC

(international standards, aviation) IATA airport code for Ciudad Mante National Airport.


MUC

(international standards, aviation) IATA airport code for Munich Airport, which serves Munich, Bavaria, Germany.


RCH

(international standards, aviation) IATA airport code for Almirante Padilla Airport, which serves Riohacha, La Guajira, Colombia.


(computing) The left-arrow key on a computer keyboard, used for navigation and various keyboard commands.

(mathematics, computer science) assignment


(computing) The enter key or the newline character.


ABW

(international standards, aviation) IATA airport code for Abau Airport, which serves Abau, Southern Region, Papua New Guinea.


COK

(international standards, aviation) IATA airport code for Cochin International Airport, which serves Kochi, Kerala, India.


BLR

(international standards, aviation) IATA airport code for Kempegowda International Airport, which serves Bangalore, Karnataka, India.


REU

(international standards, aviation) IATA airport code for Reus Airport, which serves Costa Daurada, Catalonia, Spain.


SEN

(international standards, aviation) IATA airport code for London Southend Airport, which serves London, United Kingdom.


SLB

(international standards, aviation) IATA airport code for Storm Lake Municipal Airport, which serves Storm Lake, Iowa, USA.


MNG

(computing) Multiple-image Network Graphics (a raster image file format, designed to succeed multi-image static GIF (GIF 87b))


(computing, dated) ISO 2047 symbol for Bell


(computing) print screen (a command to capture the screen display as an image)


^J

(computing) The ASCII control character line feed in caret notation.


^G

(computing) The ASCII control character bell in caret notation.


(computing) The ASCII control character null in caret notation.


^I

(computing) The ASCII control character horizontal tab in caret notation.


^F

(computing) The ASCII control character acknowledgement in caret notation.


^B

(computing) The ASCII control character start of text in caret notation.


^O

(computing) The ASCII control character shift in in caret notation.


^X

(computing) The ASCII control character cancel in caret notation.


^A

(computing) The ASCII control character start of header in caret notation.


^M

(computing) The ASCII control character carriage return in caret notation.


^P

data link escape
data link escape#English

(computing) The ASCII control character data link escape in caret notation.


^E

(computing) The ASCII control character enquiry in caret notation.


^D

(computing) The ASCII control character end of transmission in caret notation.


^C

(computing) The ASCII control character end of text in caret notation.


^L

(computing) The ASCII control character form feed in caret notation.


^N

(computing) The ASCII control character shift out in caret notation.


^Q

(computing) The ASCII control character device control 1 in caret notation.


^K

(computing) The ASCII control character vertical tab in caret notation.


^S

(computing) The ASCII control character device control 3 in caret notation.


^Z

(computing) The ASCII control character substitute in caret notation.


^R

(computing) The ASCII control character device control 2 in caret notation.


^U

(computing) The ASCII control character negative acknowledgement in caret notation.


^V

(computing) The ASCII control character synchronous idle in caret notation.


^T

(computing) The ASCII control character device control 4 in caret notation.


^Y

(computing) The ASCII control character end of medium in caret notation.


`lowbar`

head

`lowbar` (English symbol name underscore or underline)

`lowbar` (canonical)
underscore (English name symbol)
underline (English name symbol)

MS-DOS prompt: C:\>_

] [
Unsupported titles/Space#Translingual

visual display unit
visual display unit#English

(computing) Used to represent what would normally be a space ] [ in computing.

Used as a cursor to indicate a place where text can be typed. On visual display units, the underscore may be made to blink.

(programming) Especially as a prefix: used to denote a special identifier such as a global or private variable or a reserved symbol.

My email address is jon_smith@example.com.


`num`

`num` (English symbol name number sign or hash or pound sign or octothorpe)

`num` (canonical)
number sign (English name symbol)
hash (English name symbol)
pound sign (English name symbol)
octothorpe (English name symbol)

(mathematics, computer science) Concatenation.


`gt`

Go to File > Save As > CSV file > OK

(computing) Synonym of → (“indicates a series of steps to achieve a task in software”)

c:\users\home\> (Command Prompt in Microsoft Windows)

(computing) Indicates that the user is being prompted for input.


`vert`

`vert` (English symbol name vertical bar or vertical line or pipe)

`vert` (canonical)
vertical bar (English name symbol)
vertical line (English name symbol)
pipe (English name symbol)

(programming) Used in some programming languages as the "bitwise or" operator.


A simplification of the punctus elevatus, ⟨⹎⟩.

John 3:14–16 (or John III:14–16)

(information science) Separate elements of a bibliographic reference, such as chapter and verses of the bible, or volumes and pages of a work.


C: is the default system drive on Windows.

(computing) Indicates a storage or media drive letter (with or without path).

(networking) Separates the parts of an IPv6 address.


`period`

The periodos of Aristophanes of Byzantium, ca. 200 BCE. Originally there were three dots: ⟨·⟩ at mid height (the comma), ⟨.⟩ at the baseline (the colon), and ⟨˙⟩ at capital height (the periodos). When minuscule writing became common, it proved difficult to make a three-way height distinction, and only the periodos was retained, though it shifted to the baseline.

point.x

the ‘x’ property of the ‘point’ variable

In various programming languages, the structure access operator.

echo 'I am currently ' . myAge(1981) . ' old.';

In various programming languages, the string concatenation operator.

ls .

list the contents of the current directory

In various operating systems, the current directory.

div.quotedtext {font-style: italic}

The class selector in CSS, which intends to format a class of an element. (A class can appear freely one or more times in a page, as opposed to the ID selector: #).

document.txt

the file with the base name ‘document’ and the extension ‘txt’

Separates a file name from its extension.

en.wiktionary.org

the Internet domain name with components ‘en’, ‘wiktionary’, and ‘org’

top-level domain
top-level domain#English

Separates the parts of the domain name of a website (including the subdomain and the top-level domain).

version 1.2.16

Separates the parts of a version number.

Separates the parts of an IP address (IPv4).

(regular expressions) Matches any single character.


(programming) A namespace or scope resolution operator in some programming languages.

2001:db8::ff00:42:8329 = 2001:0db8:0000:0000:0000:ff00:0042:8329

1 = 0000:0000:0000:0000:0000:0000:0000:0001

(networking) Contracted notation of an IPv6 address which contains consecutive zeros in between colons.


(computing, programming) Assignment. Indicates the that the value or computed expression on the right is to be stored in the variable or address location on the left.


`lt``gt`

(mathematics, programming) Not equal to.


ά

(electrical engineering) Temperature coefficient of resistance.


(engineering, physics) The mho (unit of conductance)


ℰ

(mathematics, computer science) A level of the Grzegorczyk hierarchy


(mathematics, game theory) An arbitrary game.


AAT

(international standards, aviation) IATA airport code for Altay Airport, which serves Altay City, Xinjiang, China.


ABV

(international standards, aviation) IATA airport code for Nnamdi Azikiwe International Airport, which serves Abuja, Nigeria.


FMM

(international standards, aviation) IATA airport code for Memmingen Airport, which serves Memmingen, Bavaria, Germany.


SXF

(international standards, aviation, obsolete) Former IATA airport code for Berlin Schönefeld Airport, which served Berlin, Germany until 2020.


BRE

(international standards, aviation) IATA airport code for Bremen Airport, which serves Bremen, Germany.


BER

(international standards, aviation) IATA airport code for Berlin Brandenburg Airport, which serves Berlin, Germany.

(international standards, aviation, obsolete) Former IATA metropolitan area code for Berlin, Germany, collectively referring to the airport system of Tegel Airport and Schönefeld Airport until 2020.


ACP

(international standards, aviation) IATA airport code for Sahand Airport, which serves Maragheh, East Azerbaijan, Iran.


ABF

(international standards, aviation) IATA airport code for Abaiang Airport, which serves Abaiang, Kiribati.


(technology, Internet) The first version of something.


(technology, Internet) The second version of something.


A Copy Items box is displayed. Expand the My Computer folder, if necessary, and then click on 💾 3½ Floppy (A:).

2004, Cia Training Ltd Staff, E-Quals Unit 021 It Principles Level 2 (in English), CIA Training Ltd., →ISBN, page 62:

(graphical user interface) A floppy disk.

7. Click 💾
Your change to the memo is saved.

2013, Jennifer Duffy, Carol Cram, Microsoft Word 2013: Illustrated Complete (in English), Cengage Learning, →ISBN, page 8:

(graphical user interface) An icon that represents saving digital data to any storage medium.


(programming) Increment by 1 (in certain programming languages such as C and Java).


DIB

(international standards, aviation) IATA airport code for Dibrugarh Airport, which serves Dibrugarh, Assam, India.


ADS

(international standards, aviation) IATA airport code for Addison Airport, which serves Dallas, Texas, United States.


Vss

field-effect transistor
field-effect transistor

(electronics) voltage source source — a terminal on an FET (field-effect transistor) circuit (in an nMOS MOSFET, this is used as the drain, connected to ground)


(aviation) 100-octane rating (octane number) low lead leaded avgas, with TEL octane booster


DTW

(international standards, aviation) IATA airport code for Detroit Metropolitan Wayne County Airport, which serves Detroit, Michigan, United States.


JNG

(computing) JPEG Network Graphics (a raster image file format, using JPEG compression, with the file structure of PNG)


APNG

(computing) Animated Portable Network Graphics; a file format for animated multi-image raster graphics with lossless compression designed to replace Netscape GIF 89b format, based on the PNG file format


ADF

(international standards, aviation) IATA airport code for Adıyaman Airport, which serves Adıyaman, Turkey.


JAX

(international standards, aviation) IATA airport code for Jacksonville International Airport, which serves Jacksonville, Florida, United States.


PVD

(international standards, aviation) IATA airport code for T. F. Green International Airport, which serves Providence, Rhode Island, United States.


(computing) The down-arrow key on a computer keyboard, used for navigation and various keyboard commands.


ABG

(international standards, aviation) IATA airport code for Abingdon Airport, which serves Abingdon Downs, Queensland, Australia.


KUN

(international standards, aviation) IATA airport code for Kaunas Fluxus Airport, which serves Kaunas, Lithuania.


Originated in the notation for hexadecimal numbers in the C programming language (first major revision described in The C Programming Language, published 1978) and its descendants.

Available RAM using ARMulator or Evaluator-7T extends from 0x8000 to 0xffff while that using the LPC2102 with the Keil tools is from 0x40000000 to 0x40000fff.

2007, J. R. Gibson, ARM Assembly Language - an Introduction (in English), page 106:

(computing) Indicates that the number that follows is in hexadecimal.


(telecommunications): From entry 73 in the Phillips Code, originally a list from 1 to 92 of numeric codes used to abbreviate common phrases used on telegraph lines.

(telecommunications) regards, best regards (a valediction among ham radio enthusiasts).


AAF

(international standards, aviation) IATA airport code for Apalachicola Regional Airport, which serves Apalachicola, Florida, United States.


ACM

(international standards, aviation) IATA airport code for Arica Airport, which serves Puerto Arica, Amazonas, Colombia.


ADM

(international standards, aviation) IATA airport code for Ardmore Municipal Airport, which serves Ardmore, Oklahoma, United States.


AAU

(international standards, aviation) IATA airport code for Asau Airport, which serves Asau, Savaiʻi, Samoa.


LHR

(international standards, aviation) IATA airport code for London Heathrow Airport, which serves London, United Kingdom.


CGP

(international standards, aviation) IATA airport code for Shah Amanat International Airport, which serves Chittagong, Bangladesh.


The bottom arrow pointing right is the rightward tab; the top arrow pointing left is the leftward tab, or "shift+tab" which may serve to reverse the role of tab in some programs.

⇆Tab to Move Down to Notes Button

(computing) The tab (tabulation) symbol found in keyboards.


PMH

(international standards, aviation) IATA airport code for Greater Portsmouth Regional Airport.


ABP

(international standards, aviation) IATA airport code for Atkamba Airport, which serves Atkamba, Western Province, Papua New Guinea.


ACH

(international standards, aviation) IATA airport code for St. Gallen–Altenrhein Airport, which serves St. Gallen, Switzerland.


CCU

(international standards, aviation) IATA airport code for Netaji Subhas Chandra Bose International Airport, which serves Kolkata, West Bengal, India.


AAV

(international standards, aviation) IATA airport code for Allah Valley Airport, which serves Allah Valley, South Cotabato, Philippines.


ACU

(international standards, aviation) IATA airport code for Achutupo Airport, which serves Achutupo, Guna Yala, Panama.


AAB

(international standards, aviation) IATA airport code for Arrabury Airport, which serves Arrabury, Queensland, Australia.


(graphical user interface) A briefcase in Microsoft Windows, which is a folder able to synchronize files with another folder.


(databases) A primary key. (a column able to identify every row in the table)


(graphical user interface) an icon which converts speech into text


OAK

(international standards, aviation) IATA airport code for Oakland International Airport, which serves Oakland, California, United States.


ONT

(international standards, aviation) IATA airport code for Ontario International Airport, which serves Ontario, California, United States.


(computer science) blank symbol, used in Turing machine diagrams


ABQ

(international standards, aviation) IATA airport code for Albuquerque International Sunport, which serves Albuquerque, New Mexico, United States.


(a) (rare) egressive airstream mechanism when used with a letter for an ingressive sound, e.g. [ʘ↑]

(b) exhalation when used alone, [↑].

(number theory, computer science) exponentiation

(computing) The up-arrow key on a computer keyboard, used for navigation and various keyboard commands.


(mathematics, category theory) epimorphism or surjection


HIJK

(aviation) air traffic control identifier code for a hijacked aircraft transmitted via aircraft transponder when transponder set to squawk code 7500


(computing) Unofficial symbol for the Windows Key because of its resemblance to the Windows logo, and is nearly identical to the Windows 11 logo.


(computing, dated) ISO 2047 symbol for Data Link Escape


(computing, dated) ISO 2047 symbol for Enquiry


TAI

(international standards, aviation) IATA airport code for Taiz International Airport, which serves Taiz, Yemen.

TACA International Airlines
w:TACA International Airlines

(international standards, aviation) ICAO code for TACA International Airlines.


EDD

(international standards, aviation) IATA airport code for Erldunda Airport, which serves Erldunda, Northern Territory, Australia.


DTIME

(computer science) A class of problems solvable by a deterministic Turing machine in given asymptotic time.


(computer science) modified subtraction, cutoff subtraction: a binary operator which evaluates to the difference between its operands if it is non-negative, and to 0 otherwise


DSPACE

(computer science) A class of problems solvable by a deterministic Turing machine in a given asymptotic amount of space.


MSO

(logic, computer science) Monadic second-order logic.


(computing) adjustable in horizontal direction


ADE

(international standards, aviation) IATA airport code for Aden International Airport, which serves Aden, Yemen.


From SAT and 3, the number of literals per clause.

conjunctive normal form
conjunctive normal form

(computing theory) The decision problem of deciding whether a given Boolean formula in conjunctive normal form with three literals per clause is satisfiable. A famous NP-complete problem.


From SAT and 2, the number of literals per clause.

(computing theory) The decision problem of deciding whether a given Boolean formula in conjunctive normal form with two literals per clause is satisfiable.


TQBF

From English True (or totally) quantified Boolean formula.

∃x_1∀x_2∃x_3...Q_nx_nf(x_1,x_2,x_3,...,x_n)

Where Q_n is ∀ if n is even and ∃ if n is odd.

(computing theory) The decision problem of, given a Boolean function f on n variables, deciding whether the following formula is satisfiable:


Aut

(algebra, category theory) The set of automorphisms of a specific object.


Hom

Hom(U⊗V,W)≅Hom(U,Hom(V,W)).

(mathematics, chiefly category theory) The set of morphisms between two specific objects.


''1'' is text; 1 without quotation marks is a number.

programming language
programming language

(programming) Encloses a string literal in some programming languages.

Straight single quotation mark and apostrophe


Curved single quotation marks and apostrophes

"1" is text, 1 without quotation marks is a number.

(programming) Encloses a string literal in some programming and markup languages.

Search for "heads or tails" for the exact phrase. If you forget the quotation marks, you'll surely see results with "heads" and "tails" separately.

(computing) In some search engines, searches for the exact word of phrase.


`lcub` `rcub`

{ } (English symbol name curly brackets or braces)

curly bracket s (English name symbol)
braces (English name symbol)

doSomethingTwice () { return doSomething () + doSomething () }

(programming) Used in some programming languages, especially C-type languages.

if (x>4) { result = "congratulations!" }


getSum (a, b)

result = a + b

return result

(programming) Used when defining a new function, enclosing the list of parameters.

result = getFirstNumber() + getSecondNumber() + getThirdNumber()

(programming) Used when calling an existing function, enclosing the list of arguments.

if (x > 7) then printf "success!" end

(programming) Used with some expressions and conditionals, like "if", "switch", "for", "while", etc., in certain programming languages.


`lsqb` `rsqb`

DROP TABLE tbl_name [, tbl_name] ...

(computing, programming) Encloses optional parameters in syntax help.


`lsqb` `rsqb`

t[1] = "one"

t[2] = "two"

(programming) In a number of programming languages, used as the array index operator, the subscript operator.


BTC

(international standards, aviation) IATA airport code for Batticaloa International Airport, which serves Batticaloa, Eastern Province, Sri Lanka.


(computing, dated) ISO 2047 symbol for Start of Heading


(computing, dated) ISO 2047 symbol for End of Text


int x = random() // Defines x as a random number.

(programming) Begins a comment that is only applicable in the current line in some programming languages.

(networking) Indicates root path in a computer network (usually followed by a node name or an IP address).


CHA

(international standards, aviation) IATA airport code for Chattanooga Metropolitan Airport, which serves Chattanooga, Tennessee, USA.


ABI

(international standards, aviation) IATA airport code for Abilene Regional Airport, which serves Abilene, Texas, United States.


ABE

(international standards, aviation) IATA airport code for Lehigh Valley International Airport, which serves Lehigh Valley, Pennsylvania, United States.


Introduced by the B programming language, which used the symbol "=" for variable assignment. The reasoning given by the creators of the language is that assignment is more frequent than equality testing, and thus deserves the shorter operator. The syntax was inherited by its successor C, and later adopted more widely. See wikipedia:Relational operator#Confusion with assignment operators.

if x==1 then print "success!" end (prints "success!" if x equals 1)

(programming) In some programming languages, an operator that compares if two values are equal.


NPT

(international standards, aviation) IATA airport code for Newport State Airport, which serves Newport, Rhode Island, United States.


XAP

(international standards, aviation) IATA airport code for Serafin Enoss Bertaso Airport, which serves Chapecó, Santa Catarina, Brazil.


SFO

(international standards, aviation) IATA airport code for San Francisco International Airport, which serves San Francisco, California, USA.


(computing) adjustable in vertical direction


`lt` `gt` `lt`/ `gt`

<p>This is a new paragraph.'''

[written by Mark Zuckerberg at the start of the movie, after he was dumped by his girlfriend Erica]

<p><i>9:48pm'. The truth is that she has a nice face. I need to do something to take my mind off her. Easy enough, except I need an idea.'

(computing) Used in HTML and XML to open and close an element.


OSA

(international standards, aviation) IATA metropolitan area code for Osaka, Japan, collectively referring to the airport system of Kansai International Airport and Itami Airport.


(programming) Encloses a multi-line comment in some programming, markup and query languages.


`lt`!-- --`gt`

<!-- Note: I don't understand how this code works. -->

(computing) Encloses a multi-line comment in some markup languages, including HTML, XML, and SGML.


= non-breaking space

(computing) Encloses a character entity reference, which is displayed as a certain character in HTML and XML.


(programming) In some programming languages, a comparison operator that returns true if two values are equal and have the same data type.


The output of true && false is false.

(programming) The conditional "and" operator in some programming languages.


`lt` `gt`

{{#tag:syntaxhighlight|#include |inline="True"|lang="c"|style="white-space:pre-wrap;"}} – C example

{{#tag:syntaxhighlight|ArrayList|inline="True"|lang="Java"|style="white-space:pre-wrap;"}} – Java example

(programming) Encloses certain types of information in some programming languages.

{{#tag:syntaxhighlight||inline="True"|lang="html"|style="white-space:pre-wrap;"}} = displays an image

{{#tag:syntaxhighlight|
|inline="True"|lang="html"|style="white-space:pre-wrap;"}} = a line break

Unsupported titles/Less than trailing slash greater than#Translingual

(computing) Encloses certain tags in markup languages.

(computing) Encloses a standalone HTML tag. Compare < /> in XML.

Unsupported titles/HTML start tag end tag#Translingual

(computing) In HTML and XML, encloses a start tag that must be closed by an end tag. See < > for more information.


`lt` /`gt`

<br/>

Unsupported titles/Enclosing less than greater than

(computing) Encloses a standalone XML tag. Compare < >.


(programming) The inequality operator (compare ≠, !=, <>) in some programming languages, including Lua and MATLAB.


ACB

(international standards, aviation) IATA airport code for Antrim County Airport, which serves Bellaire, Michigan, United States.


SMV

(international standards, aviation) IATA airport code for Samedan Airport, which serves Samedan, Grisons, Switzerland.


SYD

(international standards, aviation) IATA airport code for Sydney Kingsford Smith Airport, which serves Sydney, New South Wales, Australia.


Start Graph by choosing Insert ⇨ Object to display the Object dialog box, choosing Microsoft Graph Chart from the Create New Tab, and then clicking OK.

2003, David Angell, Peter Kent, Word 2003 Bible (in English), John Wiley & Sons, →ISBN, page 553:

(computing) Alternative form of → (“indicates a series of steps to achieve a task in software”)


-`gt`

(programming) Arrow operator. Used to access class, structure or union members using a pointer.


(electricity) Temperature control switch.


The 🗖 button expands a window so that it fills the whole screen.

2006, Steve Rickaby, Pass ECDL in 30 Steps (in English), Cengage Learning EMEA, →ISBN, page 92:

graphical user interface
graphical user interface

(graphical user interface) Used as an icon to maximize a window.


The 🗕 button collapses a window into the taskbar.

(graphical user interface) Used as an icon to minimize a window.


The 🗗 button restores a window to its original size after 🗖 is used.

(graphical user interface) Used as an icon to cause a maximized window to be of a smaller, non-maximized size, possibly overlapping other windows if they exist.


TEZ

(international standards, aviation) IATA airport code for Tezpur Airport, which serves Tezpur, Assam, India.


ACD

(international standards, aviation) IATA airport code for Alcides Fernández Airport, which serves Acandí, Chocó, Colombia.


VIE

(international standards, aviation) IATA airport code for Vienna International Airport, which serves Vienna, Vienna, Austria.


(graphical user interface) Used as an icon to close an application window.


kBd

(computing) Symbol for kilobaud, a unit of data transfer rate equal to 10³ baud.


BOS

(international standards, aviation) IATA airport code for Logan International Airport, which serves Boston, Massachusetts, United States.


(graphical user interface) An icon to create a new (blank) file or document.


Designed after the physical buttons used on older radios to select preset stations – when one of the buttons was pressed, other buttons would pop out, leaving the pressed button the only button in the "pushed in" position.

(graphical user interface, usually found on the Internet) The radio button, which usually comes in groups (sets of multiple radio buttons), each one corresponding to an exclusive option, from which only one may be chosen. When a radio button is pressed, any previously selected radio button is automatically un-selected.


AAO

(international standards, aviation) IATA airport code for Anaco Airport, which serves Anaco, Anzoátegui, Venezuela.


(mathematics, computer science) no assignment


(computing, APL): The alpha symbol, used to format numbers as a string


CDG

(international standards, aviation) IATA airport code for Charles de Gaulle Airport, which serves Paris, France.


VIT

(international standards, aviation) IATA airport code for Vitoria Airport, which serves Vitoria-Gasteiz, Basque Country, Spain.


PDX

Vans depart from PDX every 15 minutes, from 5:30am to 12:30am.

1998, Kim Carlson, Portland Best Places, 4th edition, Seattle, Wash.: Sasquatch Books, →ISBN, →ISSN, →OCLC, →OL, page 310:

A 2007 global real estate forecast report has projected Portland to be among the top 10 office markets for investors, and if that is not enough incentive, PDX has been named the best airport for business travel by readers of Conde Nast Traveler magazine.

2007, Serena Bartlett, Diana Morgan, Portland: New View of the Rosy City, GrassRoutes Travel, →ISBN, →LCCN, →OCLC, →OL, page 16:

A jetliner in Vancouver, British Columbia, waited a full ninety minutes for John Roby to land and switch planes before taking off for PDX.

2010, Dana Haynes, Crashers (Fiction), New York: Minotaur Books, →ISBN, →LCCN, →OCLC, →OL, page 27:

(international standards, aviation) IATA airport code for Portland International Airport, which serves Portland, Oregon, United States.


(computing, dated) ISO 2047 symbol for Null


(computing, dated) ISO 2047 symbol for Device Control 3


(computing, dated) ISO 2047 symbol for Device Control 4


(computing, dated) ISO 2047 symbol for Device Control 2


(computing, dated) ISO 2047 symbol for Device Control 1


(computing, dated) ISO 2047 symbol for Vertical Tabulation


(computing, dated) ISO 2047 symbol for End of Medium


(computing, dated) ISO 2047 symbol for Group Separator


(computing, dated) ISO 2047 symbol for File Separator


(computing, dated) ISO 2047 symbol for Record Separator


(computing, dated) ISO 2047 symbol for Unit Separator


(computing, dated) ISO 2047 symbol for Shift In.


(computing, dated) ISO 2047 symbol for Bell


(computing, dated) ISO 2047 symbol for End of Transmission Block


(computing, dated) ISO 2047 symbol for Form Feed


ADK

(international standards, aviation) IATA airport code for Adak Airport, which serves Adak Island, Alaska, United States.


PHX

(international standards, aviation) IATA airport code for Phoenix Sky Harbor International Airport, which serves Phoenix, Arizona, United States.


YUL

From the code assigned by Transport Canada to the airport, that was adopted by IATA as its airport code. "Y" signifies an international airport in Transport Canada terminology

(international standards, aviation) IATA airport code for Montréal–Trudeau International Airport, which serves Greater Montreal, Quebec, Canada.


AAI

(international standards, aviation) IATA airport code for Deputado Joaquim de d'Abreu Coelho Airport, which serves Arraias, Tocantins, Brazil.


ABT

(international standards, aviation) IATA airport code for Al-Baha Domestic Airport, which serves Al Bahah, Saudi Arabia.


From AISI and SAE standards nomenclature for iron and steel grades for carbon steels with a maximum of 1% carbon content.

(metallurgy) Identifying a steel grade with a maximum of 1% carbon.


For steels with 1% or less carbon content, 10- + "95" (0.95%) fractional portion of the percentage of carbon content.

(metallurgy) A common grade of high carbon steel (0.95% carbon) used for blades. This grade is not a stainless steel, thus knives made with it must be oiled to prevent rusting, but its properties are suitable to make functional presentation swords.


From AISI and SAE standards nomenclature for iron and steel grades for chromium steels with roughly 1% chromium.

(metallurgy) Identifying a chromium steel grade with roughly 1% chromium, and a varying amount of carbon.


For chromium steels with 1% or less carbon content, and roughly 1% chromium, 51- + "60" (0.60%) fractional portion of the percentage of carbon content.

(metallurgy) A common grade of stainless steel used for blades and springs. Suitable for use in functional presentation swords.


AAE

(international standards, aviation) IATA airport code for Annaba Rabah Bitat Airport, which serves Annaba, Algeria.


ternary operator
ternary operator#English


ABU

(international standards, aviation) IATA airport code for A. A. Bere Tallo Airport, which serves Atambua, East Nusa Tenggara, Indonesia.


ADU

(international standards, aviation) IATA airport code for Ardabil Airport, which serves Ardabil, Iran.


LZA

(international standards, aviation) IATA airport code for Luiza Airport, which serves Luiza, Kasaï-Central, Democratic Republic of the Congo.


LZY

(international standards, aviation) IATA airport code for Nyingchi Mainling Airport, which serves Nyingchi, Tibet Autonomous Region, China.


KHH

Abbreviation of Kaohsiung. (Wade–Giles transliteration) (the second largest city in the Republic of China (Taiwan))

gloss

Why backhaul from HKG/MNL/SIN? We have 11 departures weekly from LAX & SFO via Taipei. 4 freighters weekly stop first in KHH on request (subject to shipment size). China Airlines to Kaohsiung. WE'VE GOT MORE GOING FOR YOU

1979 July 1, Air Cargo Guide, volume 23, number 7 (in English), →ISSN, →OCLC, page 289:

Kaohsiung International Airport (KHH) This modest sized airport is properly staffed so you can be sure of getting through customs and immigration quickly and then on to Tainan or Kenting.

2014, Steven Crook, Taiwan (Bradt Travel Guides) (in English), →ISBN, →OCLC, page 47:

KHH is ranked first for this component. KHH's SMS practice is ‘‘Local Culture-based’’ (e.g., personally reminding each other about safety and being concerned about all stakeholders in the airport); all the stakeholders are respected and assisted (e.g., at the many meetings with pilots every quarter).

2015 June, Yu-Hern Chang, Pei-Chi Shao, Hubert J.Chen, “Performance evaluation of airport safety management systems in Taiwan”, in Safety Science, volume 75 (in English), →DOI, →ISSN, →OCLC, page 81:

In this study, we analyzed and collected data on energy consumption in the terminal buildings at KHH. We also surveyed respondents at KHH, Taoyuan (TPE), and Songshan (TSA) International Airports about a number of energy conservation methods.

2017, Ching-Cheng Chao, Cheng-Hsun Yeh, Chih-Han Yeh, “Energy Conservation Strategies in Airports - A Case Study of Taoyuan, Songshan and Kaohsiung International Airports”, in Journal of the Eastern Asia Society for Transportation Studies, volume 17 (in English), →DOI, →ISSN, →OCLC, page 2075:

(international standards, aviation) IATA airport code for Kaohsiung International Airport, which serves Kaohsiung, Taiwan.


DRT

(international standards, aviation) IATA airport code for Del Rio International Airport, which serves Del Rio, Texas, United States.


From 0.308 English inches, the bullet diameter.


From 5.56 millimetres, the internal diameter, from the top of the lands in the barrel rifling. (the bullet calibre would be 5.664 mm (0.223")).


From 7.62 millimetres, the internal diameter, from the top of the lands in the barrel rifling. (the bullet calibre would be 7.82 mm (0.308")).


From 0.223 English inches, the bullet diameter.


.png

From English PNG, which is an initialization of the word Portable Network Graphics.


LGA

(international standards, aviation) IATA airport code for LaGuardia Airport, which serves New York City, United States.


ZUC

(international standards, aviation) IATA airport code for Ignace Municipal Airport, which serves Ignace, Ontario, Canada.


PUZ

(international standards, aviation) IATA airport code for Puerto Cabezas Airport, which serves Puerto Cabezas, Nicaragua.


(computing) Indicates that the number that follows is in binary.


(rare, computing) Alternative form of 0b


.gif

From English GIF, which is an initialization of Graphics Interchange Format.


(computing) Indicates that the number that follows is in octal.


(rare, computing) Alternative form of 0x


.jpeg

From English JPEG (“Joint Photographic Experts Group”).

der

(computing) An extension for JPEG files.


(rare, computing) Alternative form of 0o


.jpe

From English .jpeg, modified to fit the three-letter file extension format at the time.


CSX

(international standards, aviation) IATA airport code for Changsha Huanghua International Airport, which serves Changsha, Hunan, China.


ADV

(international standards, aviation) IATA airport code for Ed Daein Airport, which serves Ed Daein, East Darfur, Sudan.


(electrochemistry, electronics, electrical) Alternative form of 18650


(electrochemistry, electronics, electrical) Alternative form of 4680


46 + 80. From the dimensions of the electrochemical cell package, 46-millimetres in diameter and 80-millimeters tall.

(electrochemistry, electronics, electrical) A cylindrical rechargeable battery cell format for lithium-ion chemistry batteries


From the trademark "NE2000", from the Novell product. From k/K being the symbolic abbreviation of 1000.

(computing, telecommunications, countable) An ethernet network card compatible with the Novell NE2000

(computing, telecommunications, uncountable) A defacto industry standard for ethernet network cards, which implement compatibility with the Novell NE2000


From the trademark "NE1000", from the Novell product. From k/K being the symbolic abbreviation of 1000.

(computing, telecommunications, countable) An ethernet network card compatible with the Novell NE1000

(computing, telecommunications, uncountable) A defacto industry standard for ethernet network cards, which implement compatibility with the Novell NE1000


MCM

(international standards, aviation) IATA airport code for Monaco Heliport.


ABK

(international standards, aviation) IATA airport code for Kabri Dar Airport, which serves Kebri Dahar, Somali Region, Ethiopia.


LTN

(international standards, aviation) IATA airport code for London Luton Airport, which serves London, United Kingdom.


SEL

(international standards, aviation) IATA metropolitan area code for Seoul, South Korea, collectively referring to the airport system of Incheon International Airport and Gimpo International Airport.


IAF

(astronautics) Initialism of International Astronautical Federation.; from English IAF. The international federation for astronautics and space advocay


BBI

(international standards, aviation) IATA airport code for Biju Patnaik Airport, which serves Bhubaneswar, Odisha, India.


.JNG

From English JNG, which is an initialization of the word JPEG Network Graphics.


.MNG

From English MNG, which is an initialization of the word Multiple-image Network Graphics.


.JPG

(computing) An extension for JPEG files.


FODG

From FODG, which is an initialization of the term Flat XML ODF Graphics.

(computing) An ODF extension for graphics files.


FODP

From FODP, which is an initialization of the term Flat XML ODF Presentations.

(computing) An ODF extension for presentation files.


FODS

From FODS, which is an initialization of the term Flat XML ODF Spreadsheets.

(computing) An ODF extension for spreadsheet files.


FODT

From FODT, which is an initialization of the term Flat XML ODF Text Documents.

(computing) An ODF extension for text or word processing files.


head

` (English name backtick or backquote or backprime)

backtick (English name)
backquote (English name)
backprime (English name)

(dated, computing) Alternative form of ‘ (quotation mark)

The echo and sed commands appear within backprimes (`) that indicate command substitution: The result of executing the commands within the backprimes replaces the backprimes and everything between them.

1997, Mark G. Sobell, “The TC Shell”, in A Practical Guide to Linux, Reading, MA: Addison-Wesley, →ISBN, page 440:

(computing) Used as an enclosing construct in some programming languages


DEL

(international standards, aviation) IATA airport code for Indira Gandhi International Airport, which serves Delhi, India.


PKX

(international standards, aviation) IATA airport code for Beijing Daxing International Airport, which serves Beijing, China.


PEK

(international standards, aviation) IATA airport code for Beijing Capital International Airport, which serves Beijing, China.


GOI

(international standards, aviation) IATA airport code for Dabolim Goa International Airport, which serves Goa, India.


LON

(international standards, aviation) IATA metropolitan area code for London, United Kingdom, collectively referring to the airport system of Heathrow Airport, Gatwick Airport, Stansted Airport, Luton Airport, London City Airport, Southend Airport and Biggin Hill Airport.


HYD

(international standards, aviation) IATA airport code for Rajiv Gandhi International Airport, which serves Hyderabad, Telangana, India.


ORD

(international standards, aviation) IATA airport code for Chicago O'Hare International Airport, which serves Chicago, Illinois, United States.


AAK

(international standards, aviation) IATA airport code for Aranuka Airport, which serves Aranuka, Kiribati.


ABJ

(international standards, aviation) IATA airport code for Félix-Houphouët-Boigny International Airport, which serves Abidjan, Ivory Coast.


ABX

(international standards, aviation) IATA airport code for Albury Airport, which serves Albury, New South Wales, Australia.


ABZ

(international standards, aviation) IATA airport code for Aberdeen International Airport, which serves Aberdeen, Scotland, United Kingdom.


AAG

(international standards, aviation) IATA airport code for Avelino Vieira Airport, which serves Arapoti, Paraná, Brazil.


ABL

(international standards, aviation) IATA airport code for Ambler Airport, which serves Ambler, Alaska, United States.


AAN

(international standards, aviation) IATA airport code for Al Ain International Airport, which serves Al Ain, Abu Dhabi, United Arab Emirates.


AAJ

(international standards, aviation) IATA airport code for Cayana Airstrip, which serves Kajana, Suriname.


AAY

(international standards, aviation) IATA airport code for Al Ghaydah Airport, which serves Al Ghaydah, Al Mahrah, Yemen.


ACY

(international standards, aviation) IATA airport code for Atlantic City International Airport, which serves Atlantic City, New Jersey, United States.


ACZ

(international standards, aviation) IATA airport code for Zabol Airport, which serves Zabol, Sistan and Baluchestan, Iran.


ACX

(international standards, aviation) IATA airport code for Xingyi Wanfenglin Airport, which serves Xingyi, Guizhou, China.


ABY

(international standards, aviation) IATA airport code for Southwest Georgia Regional Airport, which serves Albany, Georgia, United States.


AAQ

(international standards, aviation) IATA airport code for Anapa Airport, which serves Anapa, Krasnodar Krai, Russia.


AAZ

(international standards, aviation) IATA airport code for Quetzaltenango Airport, which serves Quetzaltenango, Guatemala.


ACJ

(international standards, aviation) IATA airport code for Anuradhapura Airport, which serves Anuradhapura, North Central Province, Sri Lanka.


ACN

(international standards, aviation) IATA airport code for Ciudad Acuña International Airport, which serves Ciudad Acuña, Coahuila, Mexico.


AAX

(international standards, aviation) IATA airport code for Romeu Zema Airport, which serves Araxá, Minas Gerais, Brazil.


ABB

(international standards, aviation) IATA airport code for Asaba International Airport, which serves Asaba, Delta State, Nigeria.


ADJ

(international standards, aviation) IATA airport code for Amman Civil Airport, which serves Amman, Jordan.


ADI

(international standards, aviation) IATA airport code for Arandis Airport, which serves Arandis, Erongo Region, Namibia.


ACR

(international standards, aviation) IATA airport code for Araracuara Airport, which serves Araracuara, Amazonas, Colombia.


ADG

(international standards, aviation) IATA airport code for Lenawee County Airport, which serves Adrian, Michigan, United States.


ADY

(international standards, aviation) IATA airport code for Alldays Airport, which serves Alldays, Limpopo, South Africa.


AAH

(international standards, aviation) IATA airport code for Aachen Merzbrück Airfield, which serves Aachen, North Rhine-Westphalia, Germany.


ADZ

(international standards, aviation) IATA airport code for Gustavo Rojas Pinilla International Airport, which serves San Andrés, San Andrés y Providencia, Colombia.


SPK

(international standards, aviation) IATA metropolitan area code for Sapporo, Hokkaido, Japan, collectively referring to the airport system of New Chitose Airport and Sapporo Okadama Airport.


BJS

(international standards, aviation) IATA metropolitan area code for Beijing, China, collectively referring to the airport system of Beijing Capital International Airport, Beijing Daxing International Airport and (until 2019) Beijing Nanyuan Airport.


JKT

(international standards, aviation) IATA metropolitan area code for Jakarta, Indonesia, collectively referring to the airport system of Soekarno–Hatta International Airport and Halim Perdanakusuma International Airport.

(international standards, aviation, obsolete) Former IATA airport code for Kemayoran Airport, which served Jakarta, Indonesia until 1985.


TYO

(international standards, aviation) IATA metropolitan area code for Tokyo, Japan, collectively referring to the airport system of Narita International Airport and Haneda International Airport.


ADX

(international standards, aviation) IATA airport code for Leuchars Station in Leuchars, Scotland, United Kingdom.

(international standards, aviation, obsolete) Former IATA airport code for RAF Leuchars in Leuchars, Scotland, United Kingdom until 2015.


(computing) Marks the beginning of a block of ruby text.


(computing) Separates characters that each bear ruby characters.


`gt``gt``gt`

Alternative form: ⋙

(programming) The right shift operator in some programming languages.


`lt``lt`

Alternative form: ≪

(programming) The left shift operator in some programming languages.


`gt``gt`

Alternative form: ≫


`lt``lt``lt`

Alternative form: ⋘


BWI

“The flights are really expensive,” she says, “because it’s so last-minute.”
I ignore the implication. “BWI, right?”

2022, Namwali Serpell, The Furrows, Hogarth, page 211:

(international standards, aviation) IATA airport code for Baltimore/Washington International Airport, which serves Baltimore, Maryland, United States of America.


[🔎 appears to the left of the search box.]

(graphical user interface) An icon to search something.

(graphical user interface) An icon to zoom in or enlarge content.


[This system-wide desktop search feature for macOS and iOS uses a left-leaning magnifying glass as its search icon.]

You can also use the Search function (🔍) to look for interesting events or places with their associated teleport links, maps, and information.

2022 December 5, Julian Chen, Second Life as a Virtual Playground for Language Education: A Practical Guide for Teaching and Research (in English), Taylor & Francis, →ISBN, unnumbered page:


(graphical user interface) Represents a user profile or contact.


(graphical user interface) Represents multiple user profiles or contacts.


(graphical user interface, Internet) A shopping cart or basket.


(computing) An icon that increases the brightness of a screen.


(graphical user interface) An icon that indicates the battery percentage of a computer or mobile device.


(computing) An icon that decreases the brightness of a screen.


(graphical user interface, Internet slang) To pin. (“To attach (an icon, application, message etc.) to another item so that it persists.”)


HOM

(international standards, aviation) IATA airport code for Homer Airport, which serves Homer, Alaska, USA.


\n

From the escape sequence used in the C programming language and its numerous derivatives.

(programming) A representation of the newline character.


\t

(programming) A representation of the tab character.


\r

(programming) A representation of the carriage return character.


\b

(programming) A representation of the backspace character.


\f

(programming) A representation of the form feed character.


\v

(programming) A representation of the vertical tab character.


Alternative form: \000

(programming) A representation of the null character.


\a

From the escape sequence used in the C programming language and its numerous derivatives; from \ (escape character) + an initialism of alert.

(programming) A representation of the bell character.


DXN

(international standards, aviation) IATA airport code for Noida International Airport, which serves Jewar, Uttar Pradesh, India.


KHI

(international standards, aviation) IATA airport code for Jinnah International Airport, which serves Karachi, Sindh, Pakistan.


IRD

(international standards, aviation) IATA airport code for Ishwardi Airport, Bangladesh.


ZYL

(international standards, aviation) IATA airport code for Osmani International Airport, which serves Sylhet, Bangladesh.


In the Settings app, tap the switch next to Airplane Mode. You see an airplane ✈ icon in the top status bar when the mode is active. (When you turn the mode on or off, the airplane ✈ icon cutely flies in or out.)

2023 September 18, Glenn Fleishman, “Manage Airplane Mode”, in Take Control of iOS & iPadOS Privacy and Security, 4 edition (in English), alt concepts^([sic]), →ISBN:

(graphical user interface) Airplane mode.


LCY

(international standards, aviation) IATA airport code for London City Airport, which serves London, United Kingdom.


LGW

(international standards, aviation) IATA airport code for London Gatwick Airport, which serves London, United Kingdom.


On iOS's e-mail client, unread e-mails are marked with 🔵 at the top left fronting the subject title.

On Telegram, unread messages are denoted with 🔵 at their right.

(computing, social media) An unread notification, message or e-mail.


🟡 Single-click the yellow button to minimize the window, which sends a tiny icon down into the Dock, on the right side.

2010, Robin Williams, John Tollett, Mac OS X 10.6 Snow Leopard (in English), Peachpit Press, →ISBN, page 9:

(graphical user interface) On Apple Mac computers, a button that when pressed minimises a window.

(graphical user interface, social media) AFK; idle; inactive.


(graphical user interface, mobile telephony) On iPhones and iPadOS, indicates that the microphone is activated.


When you finish, click the Close button (the red circle in the upper-left corner) to simply close the Safari window or choose Safari⇒Quit Safari to completely exit the application.

2012, Joe Hutsko, Barbara Boyd, Macs All-in-One For Dummies (in English), Wiley, →ISBN, unnumbered page:

(technology) A button to exit, close or delete something.

A fully red circle indicates that you're likely to see a problem in the specific browser. For example, the Internet Explorer problem related to links, lists, and the display property mentioned previously is nearly a sure thing.

2008, David Sawyer McFarland, Dreamweaver CS4: The Missing Manual (in English), O'Reilly Media, →ISBN, page 132:

(technology) An error or invalid action; incomplete.

(graphical user interface, proscribed) A button that when pressed displays the previous page.

The red dot on your Apple Watch is a signal that shows you have unread notifications. These can be anything from calls and texts to push notifications from apps, like somebody liking your post on Facebook or requesting to follow you on Instagram.

2023 January 10, Sarah Vincent, “What Is That Red Dot on Your Apple Watch—and How Do You Get Rid of It?”, in Reader's Digest (in English):

(graphical user interface, social media) An unread notification.


(computing, Internet) Indicates an action has occurred; success, completed.

(graphical user interface) A button that when pressed opens a page or webpage; or, enables full screen mode.

(graphical user interface, social media) Online; active; available.

(graphical user interface, mobile telephony) On iPhones and iPadOS, indicates that the camera is enabled.


.kar

The KDE MIDI/Karaoke file player allows you to play .mid and .kar files if your sound card has hardware support for raw MIDI files.

2006, Michael Jang, Mastering Red Hat Linux 9, page 529:

(computing) An extension for MIDI "karaoke" files.


n**2 = n² = n × n


From the fact that the C programming language states that a character escape sequence may consist of a maximum of three octal digits; if the shorter sequence \0 is followed by an octal digit which is intended to represent the next character, then \000 is required to prevent that digit from being interpreted as part of the escape sequence instead. For example, \0 followed by 1 would be interpreted as the escape sequence \01, whereas \0001 is interpreted as \000 followed by the digit 1.

(programming) Alternative form of \0 (null character).


(graphical user interface) Used as an icon for a text file.


PEE

(international standards, aviation) IATA airport code for Perm International Airport, which serves Bolshoye Savino, Perm Krai, Russia.


🔍 Search – 👤 Profile – 📰 News – ⚙ Settings

(graphical user interface, metonymically) News.


(graphical user interface) An icon that when pressed takes the user to the home page.


KTS

(international standards, aviation) IATA airport code for Brevig Mission Airport, which serves Brevig Mission, Alaska, USA.


(computing, graphical user interface) A button to refresh (reload) a document.

(graphical user interface) Indicates that a command or task is in progress; loading.


(computing) beginning of page/document, home


(computing) Option key on Apple Macintosh computer keyboards.


GZP

(international standards, aviation) IATA airport code for Gazipaşa-Alanya Airport, which serves Gazipaşa, Alanya, Turkey.


(computing) Turns a device on or off without disconnecting the power supply; sleep mode.

(Internet, graphical user interface) Login; logout.

(Internet, graphical user interface, uncommon) Closes or exits an application or webpage.


(computing) Turns a device on or off by fully disconnecting the power supply.


TDW

(international standards, aviation) IATA airport code for Tradewind Airport, which serves Amarillo, Texas, USA.


KAN

(international standards, aviation) IATA airport code for Mallam Aminu Kano International Airport, which serves Kano, Kano State, Nigeria.


BVS

(international standards, aviation) IATA airport code for Breves Airport, which serves Breves, Pará, Brazil.


GUB

(international standards, aviation) IATA airport code for Guerrero Negro Airport, which serves San Quintín, Baja California, Mexico.


LTX

(international standards, aviation) IATA airport code for Cotopaxi International Airport, which serves Latacunga, Cotopaxi Province, Ecuador.


TUX

(international standards, aviation) IATA airport code for Tumbler Ridge Airport, which serves Tumbler Ridge, British Columbia, Canada.


MQT

(international standards, aviation) IATA airport code for Marquette Sawyer Regional Airport, which serves Marquette, Michigan, USA.


MQX

(international standards, aviation) IATA airport code for Alula Aba Nega Airport, which serves Mekelle, Tigray Region, Ethiopia.


MNL

(international standards, aviation) IATA airport code for Ninoy Aquino International Airport, which serves Metro Manila, Philippines.


SBT

(international standards, aviation) IATA airport code for Sabetta International Airport, which serves Sabetta, Yamalo-Nenets Autonomous Okrug, Russia.


.pdf

From English PDF, which is an initialization of Portable Document Format.


.djvu

From English DjVu, a contraction of deja vu.

(computing) An extension for DjVu files.