"Dm" meaning in Danish

{
  "etymology_text": "From definitionsmængde.",
  "head_templates": [
    {
      "args": {
        "1": "da",
        "2": "symbol"
      },
      "expansion": "Dm",
      "name": "head"
    }
  ],
  "lang": "Danish",
  "lang_code": "da",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Danish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Danish symbols",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "da",
          "name": "Mathematics",
          "orig": "da:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "Dm(tan) = {x∈ℝ: x≠π/2 + zπ}, hvor z∈ℤ\nThe domain of the tangent function is the subset of real numbers that are not equal to π/2 plus some multiple of π."
        }
      ],
      "glosses": [
        "The domain of a specified function."
      ],
      "id": "en-Dm-da-symbol-OmlNGbFS",
      "links": [
        [
          "mathematics",
          "mathematics"
        ]
      ],
      "raw_glosses": [
        "(mathematics) The domain of a specified function."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "Dm"
}

{
  "etymology_text": "From definitionsmængde.",
  "head_templates": [
    {
      "args": {
        "1": "da",
        "2": "symbol"
      },
      "expansion": "Dm",
      "name": "head"
    }
  ],
  "lang": "Danish",
  "lang_code": "da",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        "Danish entries with incorrect language header",
        "Danish lemmas",
        "Danish symbols",
        "da:Mathematics"
      ],
      "examples": [
        {
          "text": "Dm(tan) = {x∈ℝ: x≠π/2 + zπ}, hvor z∈ℤ\nThe domain of the tangent function is the subset of real numbers that are not equal to π/2 plus some multiple of π."
        }
      ],
      "glosses": [
        "The domain of a specified function."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ]
      ],
      "raw_glosses": [
        "(mathematics) The domain of a specified function."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "Dm"
}