three

Venters began to count them—one—two—three—four—on up to sixteen.

1912 January, Zane Grey, chapter 8, in Riders of the Purple Sage […], New York, N.Y., London: Harper & Brothers Publishers, →OCLC:

Okay, on three, we open the door and jump on the rope. One, two…
Wait, wait! Do we go on three? Or do we go on “go”?
Three! Who said anything about “go”?

2003 April 7, Michelle Lamoreaux, Robert Lamoreaux, “A Spy is Born Part II”, in Totally Spies!, season 2, episode 1, spoken by Clover (Jennifer Hale as Samantha “Sam” and Andrea Taylor), Marathon Media, via Teletoon:

Why should she care? One…two…
Do we shoot on three?
Yes on three. Like one, two, three, shoot.

2011 October 18, Paul Dini, Paul Crocker, Sefton Hill, Batman: Arkham City, spoken by Joker thugs, Warner Bros. Interactive Entertainment, via Rocksteady Studios:

A numerical value after two and before four. Represented in Arabic digits as 3; this many dots (•••).

Describing a set or group with three elements.

Table of cardinal numbers 0 to 9 in various languages

өсәү

describing set or group with three components

PIE word
 *tréyes
From Middle English thre, threo, thrie, thri, from Old English þrī, from Proto-West Germanic *þrīʀ, from Proto-Germanic *þrīz, from Proto-Indo-European *tréyes. Doublet of tres and trey.
Cognate with German drei, Albanian tre, Armenian երեք (erekʻ), Latin trēs, Latvian trīs, Lithuanian trỹs, Greek τρεῖς (treîs), Old Church Slavonic трьѥ (trĭje), and others.


three

Put all the threes in a separate container.

Anything measuring three units, as length.

All the threes will go in Mrs. Smith's class, while I'll take the fours and fives.

It was a weary time. A carriage clock had been placed on the discoloured wooden mantelpiece, and slowly its hands crept on from one to two and from two to three.

1925 July – 1926 May, A[rthur] Conan Doyle, “In which Three Investigators Come across a Dark Soul”, in The Land of Mist (eBook no. 0601351h.html), Australia: Project Gutenberg Australia, published April 2019:

(basketball) Abbreviation of three-pointer.

shirtsleeves to shirtsleeves in three generations

kolmonen

basketball: abbreviation of three-pointer