"cc" meaning in 記号

{
  "categories": [
    {
      "kind": "other",
      "name": "単位",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "記号",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "cubic centimeterの頭文字。"
  ],
  "lang": "記号",
  "lang_code": "unknown",
  "pos": "symbol",
  "pos_title": "単位記号",
  "senses": [
    {
      "glosses": [
        "（非公式）立方センチメートル。"
      ],
      "id": "ja-cc-unknown-symbol-2HR9e3Sh"
    }
  ],
  "word": "cc"
}

{
  "categories": [
    "単位",
    "記号"
  ],
  "etymology_texts": [
    "cubic centimeterの頭文字。"
  ],
  "lang": "記号",
  "lang_code": "unknown",
  "pos": "symbol",
  "pos_title": "単位記号",
  "senses": [
    {
      "glosses": [
        "（非公式）立方センチメートル。"
      ]
    }
  ],
  "word": "cc"
}