"NA" meaning in All languages combined

{
  "categories": [
    {
      "kind": "other",
      "name": "記号",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "記号_ISO 3166-1",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "英語等: Namibia"
  ],
  "lang": "記号",
  "lang_code": "unknown",
  "pos": "abbrev",
  "pos_title": "略語",
  "senses": [
    {
      "glosses": [
        "ナミビアのISO 3166-1国名コード。"
      ],
      "id": "ja-NA-unknown-abbrev-FmqYv2g0"
    }
  ],
  "tags": [
    "abbreviation"
  ],
  "word": "NA"
}

{
  "categories": [
    {
      "kind": "other",
      "name": "英語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "英語 略語",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "abbrev",
  "pos_title": "頭字語",
  "senses": [
    {
      "glosses": [
        "North America: 北アメリカ。"
      ],
      "id": "ja-NA-en-abbrev-L6Uj6snh"
    },
    {
      "glosses": [
        "not applicable: 該当なし、不適用。別表記: N/A, N.A.; 関連語: ND"
      ],
      "id": "ja-NA-en-abbrev-KgCGmPL~"
    },
    {
      "glosses": [
        "not available: 入手不能、利用できない。"
      ],
      "id": "ja-NA-en-abbrev-jltliYDa"
    }
  ],
  "tags": [
    "abbreviation"
  ],
  "word": "NA"
}

{
  "categories": [
    "英語",
    "英語 略語"
  ],
  "lang": "英語",
  "lang_code": "en",
  "pos": "abbrev",
  "pos_title": "頭字語",
  "senses": [
    {
      "glosses": [
        "North America: 北アメリカ。"
      ]
    },
    {
      "glosses": [
        "not applicable: 該当なし、不適用。別表記: N/A, N.A.; 関連語: ND"
      ]
    },
    {
      "glosses": [
        "not available: 入手不能、利用できない。"
      ]
    }
  ],
  "tags": [
    "abbreviation"
  ],
  "word": "NA"
}

{
  "categories": [
    "記号",
    "記号_ISO 3166-1"
  ],
  "etymology_texts": [
    "英語等: Namibia"
  ],
  "lang": "記号",
  "lang_code": "unknown",
  "pos": "abbrev",
  "pos_title": "略語",
  "senses": [
    {
      "glosses": [
        "ナミビアのISO 3166-1国名コード。"
      ]
    }
  ],
  "tags": [
    "abbreviation"
  ],
  "word": "NA"
}