"dd" meaning in Norwegian Nynorsk

{
  "head_templates": [
    {
      "args": {
        "1": "nn",
        "2": "phrase"
      },
      "expansion": "dd",
      "name": "head"
    }
  ],
  "lang": "Norwegian Nynorsk",
  "lang_code": "nn",
  "pos": "phrase",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "and you? what about you?",
          "word": "du då?"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Norwegian Nynorsk entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 7 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of du då? (“and you? what about you?”)."
      ],
      "id": "en-dd-nn-phrase-66~-nlfl",
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "text messaging",
          "text messaging"
        ],
        [
          "du då?",
          "du då#Norwegian_Nynorsk"
        ]
      ],
      "raw_glosses": [
        "(Internet slang, text messaging) Initialism of du då? (“and you? what about you?”)."
      ],
      "tags": [
        "Internet",
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "dd"
}

{
  "head_templates": [
    {
      "args": {
        "1": "nn",
        "2": "phrase"
      },
      "expansion": "dd",
      "name": "head"
    }
  ],
  "lang": "Norwegian Nynorsk",
  "lang_code": "nn",
  "pos": "phrase",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "and you? what about you?",
          "word": "du då?"
        }
      ],
      "categories": [
        "Norwegian Nynorsk entries with incorrect language header",
        "Norwegian Nynorsk initialisms",
        "Norwegian Nynorsk internet slang",
        "Norwegian Nynorsk lemmas",
        "Norwegian Nynorsk phrases",
        "Norwegian Nynorsk text messaging slang",
        "Pages with 7 entries",
        "Pages with entries"
      ],
      "glosses": [
        "Initialism of du då? (“and you? what about you?”)."
      ],
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "slang",
          "slang"
        ],
        [
          "text messaging",
          "text messaging"
        ],
        [
          "du då?",
          "du då#Norwegian_Nynorsk"
        ]
      ],
      "raw_glosses": [
        "(Internet slang, text messaging) Initialism of du då? (“and you? what about you?”)."
      ],
      "tags": [
        "Internet",
        "abbreviation",
        "alt-of",
        "initialism"
      ]
    }
  ],
  "word": "dd"
}