"AC90" meaning in Italian

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "en",
        "3": "AC90"
      },
      "expansion": "Unadapted borrowing from English AC90",
      "name": "ubor"
    }
  ],
  "etymology_text": "Unadapted borrowing from English AC90.",
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "noun"
      },
      "expansion": "AC90",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Italian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "AC90"
      ],
      "id": "en-AC90-it-noun-1M-6TlIz",
      "links": [
        [
          "AC90",
          "AC90#English"
        ]
      ],
      "related": [
        {
          "word": "AC72"
        },
        {
          "word": "AC45"
        }
      ]
    }
  ],
  "word": "AC90"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "it",
        "2": "en",
        "3": "AC90"
      },
      "expansion": "Unadapted borrowing from English AC90",
      "name": "ubor"
    }
  ],
  "etymology_text": "Unadapted borrowing from English AC90.",
  "head_templates": [
    {
      "args": {
        "1": "it",
        "2": "noun"
      },
      "expansion": "AC90",
      "name": "head"
    }
  ],
  "lang": "Italian",
  "lang_code": "it",
  "pos": "noun",
  "related": [
    {
      "word": "AC72"
    },
    {
      "word": "AC45"
    }
  ],
  "senses": [
    {
      "categories": [
        "Italian entries with incorrect language header",
        "Italian lemmas",
        "Italian nouns",
        "Italian terms borrowed from English",
        "Italian terms derived from English",
        "Italian terms spelled with numbers",
        "Italian unadapted borrowings from English",
        "Pages with 4 entries",
        "Pages with entries"
      ],
      "glosses": [
        "AC90"
      ],
      "links": [
        [
          "AC90",
          "AC90#English"
        ]
      ]
    }
  ],
  "word": "AC90"
}