"ef" meaning in Polish

{
  "etymology_text": "Phonetic spelling of the letter.",
  "head_templates": [
    {
      "args": {
        "1": "n",
        "indecl": "1"
      },
      "expansion": "ef n (indeclinable)",
      "name": "pl-noun"
    }
  ],
  "hyphenation": [
    "ef"
  ],
  "hyphenations": [
    {
      "parts": [
        "ef"
      ]
    }
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 15 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish terms with redundant script codes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "pl",
          "name": "Latin letter names",
          "orig": "pl:Latin letter names",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "The name of the Latin-script letter F/f."
      ],
      "id": "en-ef-pl-noun-XBUsFHBn",
      "links": [
        [
          "F",
          "F#Polish"
        ],
        [
          "f",
          "f#Polish"
        ]
      ],
      "tags": [
        "indeclinable",
        "neuter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈɛf/"
    },
    {
      "rhymes": "-ɛf"
    }
  ],
  "word": "ef"
}

{
  "etymology_text": "Phonetic spelling of the letter.",
  "head_templates": [
    {
      "args": {
        "1": "n",
        "indecl": "1"
      },
      "expansion": "ef n (indeclinable)",
      "name": "pl-noun"
    }
  ],
  "hyphenation": [
    "ef"
  ],
  "hyphenations": [
    {
      "parts": [
        "ef"
      ]
    }
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 15 entries",
        "Pages with entries",
        "Polish 1-syllable words",
        "Polish entries with incorrect language header",
        "Polish indeclinable nouns",
        "Polish lemmas",
        "Polish neuter nouns",
        "Polish nouns",
        "Polish terms with IPA pronunciation",
        "Polish terms with audio pronunciation",
        "Polish terms with redundant script codes",
        "Rhymes:Polish/ɛf",
        "Rhymes:Polish/ɛf/1 syllable",
        "pl:Latin letter names"
      ],
      "glosses": [
        "The name of the Latin-script letter F/f."
      ],
      "links": [
        [
          "F",
          "F#Polish"
        ],
        [
          "f",
          "f#Polish"
        ]
      ],
      "tags": [
        "indeclinable",
        "neuter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈɛf/"
    },
    {
      "rhymes": "-ɛf"
    }
  ],
  "word": "ef"
}