"AC" meaning in Polish

{
  "head_templates": [
    {
      "args": {
        "1": "n",
        "indecl": "1"
      },
      "expansion": "AC n (indeclinable)",
      "name": "pl-noun"
    }
  ],
  "hyphenation": [
    "A‧C"
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "autocasco"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 9 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Polish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of autocasco."
      ],
      "id": "en-AC-pl-noun-NvteMvbZ",
      "links": [
        [
          "autocasco",
          "autocasco#Polish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "indeclinable",
        "neuter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/aˈt͡sɛ/"
    },
    {
      "rhymes": "-ɛ"
    }
  ],
  "word": "AC"
}

{
  "head_templates": [
    {
      "args": {
        "1": "n",
        "indecl": "1"
      },
      "expansion": "AC n (indeclinable)",
      "name": "pl-noun"
    }
  ],
  "hyphenation": [
    "A‧C"
  ],
  "lang": "Polish",
  "lang_code": "pl",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "autocasco"
        }
      ],
      "categories": [
        "Pages with 9 entries",
        "Pages with entries",
        "Polish 2-syllable words",
        "Polish abbreviations",
        "Polish entries with incorrect language header",
        "Polish indeclinable nouns",
        "Polish lemmas",
        "Polish neuter nouns",
        "Polish nouns",
        "Polish terms with IPA pronunciation",
        "Rhymes:Polish/ɛ",
        "Rhymes:Polish/ɛ/2 syllables"
      ],
      "glosses": [
        "Abbreviation of autocasco."
      ],
      "links": [
        [
          "autocasco",
          "autocasco#Polish"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "indeclinable",
        "neuter"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/aˈt͡sɛ/"
    },
    {
      "rhymes": "-ɛ"
    }
  ],
  "word": "AC"
}