"DO" meaning in Catalan

{
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "DO"
      },
      "expansion": "DO f (invariable)",
      "name": "ca-noun"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "denomination of origin",
          "word": "denominació d'origen"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Catalan entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Catalan feminine nouns with no feminine ending",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of denominació d'origen (“denomination of origin”)"
      ],
      "id": "en-DO-ca-noun-k7yl1o5~",
      "links": [
        [
          "denominació d'origen",
          "denominació d'origen#Catalan"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "feminine",
        "initialism",
        "invariable"
      ]
    }
  ],
  "word": "DO"
}

{
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "DO"
      },
      "expansion": "DO f (invariable)",
      "name": "ca-noun"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "denomination of origin",
          "word": "denominació d'origen"
        }
      ],
      "categories": [
        "Catalan countable nouns",
        "Catalan entries with incorrect language header",
        "Catalan feminine nouns",
        "Catalan feminine nouns with no feminine ending",
        "Catalan indeclinable nouns",
        "Catalan initialisms",
        "Catalan lemmas",
        "Catalan nouns"
      ],
      "glosses": [
        "Initialism of denominació d'origen (“denomination of origin”)"
      ],
      "links": [
        [
          "denominació d'origen",
          "denominació d'origen#Catalan"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "feminine",
        "initialism",
        "invariable"
      ]
    }
  ],
  "word": "DO"
}