"0D" meaning in All languages combined

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "0D (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "zero-dimensional"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geometry",
          "orig": "en:Geometry",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Zero",
          "orig": "en:Zero",
          "parents": [
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of zero-dimensional."
      ],
      "id": "en-0D-en-adj-fqXKbbMz",
      "links": [
        [
          "zero-dimensional",
          "zero-dimensional#English"
        ]
      ],
      "synonyms": [
        {
          "word": "0d"
        },
        {
          "word": "0-D"
        },
        {
          "word": "0-d"
        }
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism",
        "not-comparable"
      ]
    }
  ],
  "word": "0D"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "0D (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "alt_of": [
        {
          "word": "zero-dimensional"
        }
      ],
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English links with redundant wikilinks",
        "English terms spelled with numbers",
        "English uncomparable adjectives",
        "English words without vowels",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Geometry",
        "en:Zero"
      ],
      "glosses": [
        "Initialism of zero-dimensional."
      ],
      "links": [
        [
          "zero-dimensional",
          "zero-dimensional#English"
        ]
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism",
        "not-comparable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "0d"
    },
    {
      "word": "0-D"
    },
    {
      "word": "0-d"
    }
  ],
  "word": "0D"
}