"L4" meaning in Polish

{
  "etymology_text": "From the name of an obsolete sick leave form.",
  "head_templates": [
    {
      "args": {
        "1": "n",
        "indecl": "1"
      },
      "expansion": "L4 n (indeclinable)",
      "name": "pl-noun"
    }
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 2 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",
          "langcode": "pl",
          "name": "Health",
          "orig": "pl:Health",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "pl",
          "name": "Money",
          "orig": "pl:Money",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "sick leave (paid absence from work specifically to recover from illness)"
      ],
      "hypernyms": [
        {
          "word": "świadczenie"
        }
      ],
      "id": "en-L4-pl-noun-ov3uI8d5",
      "links": [
        [
          "sick leave",
          "sick leave"
        ]
      ],
      "raw_glosses": [
        "(colloquial) sick leave (paid absence from work specifically to recover from illness)"
      ],
      "synonyms": [
        {
          "word": "chorobowe"
        },
        {
          "word": "zwolnienie lekarskie"
        }
      ],
      "tags": [
        "colloquial",
        "indeclinable",
        "neuter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈɛl ˈt͡ʂtɛ.rɘ/"
    }
  ],
  "word": "L4"
}

{
  "etymology_text": "From the name of an obsolete sick leave form.",
  "head_templates": [
    {
      "args": {
        "1": "n",
        "indecl": "1"
      },
      "expansion": "L4 n (indeclinable)",
      "name": "pl-noun"
    }
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 2 entries",
        "Pages with entries",
        "Polish colloquialisms",
        "Polish entries with incorrect language header",
        "Polish indeclinable nouns",
        "Polish lemmas",
        "Polish neuter nouns",
        "Polish nouns",
        "Polish terms spelled with numbers",
        "Polish terms with IPA pronunciation",
        "Polish terms with audio pronunciation",
        "pl:Health",
        "pl:Money"
      ],
      "glosses": [
        "sick leave (paid absence from work specifically to recover from illness)"
      ],
      "hypernyms": [
        {
          "word": "świadczenie"
        }
      ],
      "links": [
        [
          "sick leave",
          "sick leave"
        ]
      ],
      "raw_glosses": [
        "(colloquial) sick leave (paid absence from work specifically to recover from illness)"
      ],
      "synonyms": [
        {
          "word": "chorobowe"
        },
        {
          "word": "zwolnienie lekarskie"
        }
      ],
      "tags": [
        "colloquial",
        "indeclinable",
        "neuter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈɛl ˈt͡ʂtɛ.rɘ/"
    }
  ],
  "word": "L4"
}