"∅" meaning in Translingual

{
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    {
      "args": {
        "1": "mul",
        "2": "no",
        "3": "-"
      },
      "expansion": "Norwegian",
      "name": "der"
    },
    {
      "args": {
        "1": "no",
        "2": "ø",
        "3": "Ø"
      },
      "expansion": "Ø",
      "name": "l"
    }
  ],
  "etymology_text": "The set-theoretic meaning of this symbol was introduced by the Bourbaki group in their treatise Éléments de mathématique. André Weil has said in his autobiography that he based it on the Norwegian letter Ø.",
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol",
        "sc": "Zsym"
      },
      "expansion": "∅",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "related": [
    {
      "_dis1": "0 0",
      "english": "the zero prefix",
      "word": "∅-"
    },
    {
      "_dis1": "0 0",
      "english": "the zero suffix",
      "word": "-∅"
    },
    {
      "_dis1": "0 0",
      "english": "a zero prefix in Navajo",
      "word": "-∅-"
    },
    {
      "_dis1": "0 0",
      "word": "null determiner"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Set theory",
          "orig": "mul:Set theory",
          "parents": [
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A set with no elements: the empty set."
      ],
      "id": "en-∅-mul-symbol-2SsYqOtn",
      "links": [
        [
          "set theory",
          "set theory"
        ],
        [
          "empty set",
          "empty set"
        ]
      ],
      "raw_glosses": [
        "(set theory) A set with no elements: the empty set."
      ],
      "synonyms": [
        {
          "word": "{ }"
        },
        {
          "word": "{}"
        }
      ],
      "topics": [
        "mathematics",
        "sciences",
        "set-theory"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Linguistic morphology",
          "orig": "mul:Linguistic morphology",
          "parents": [
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            "Communication",
            "Sciences",
            "Society",
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            "Fundamental"
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          "source": "w"
        },
        {
          "_dis": "41 59",
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "44 56",
          "kind": "other",
          "name": "Translingual terms with non-redundant manual script codes",
          "parents": [
            "Terms with non-redundant manual script codes",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A null morpheme; a theoretical morpheme used in models of linguistic analysis to represent the absence of a morpheme where one might otherwise be expected."
      ],
      "id": "en-∅-mul-symbol-XqW1ppuA",
      "links": [
        [
          "linguistic",
          "linguistic"
        ],
        [
          "morphology",
          "morphology"
        ],
        [
          "null morpheme",
          "null morpheme"
        ],
        [
          "morpheme",
          "morpheme"
        ],
        [
          "analysis",
          "analysis"
        ]
      ],
      "raw_glosses": [
        "(linguistic morphology) A null morpheme; a theoretical morpheme used in models of linguistic analysis to represent the absence of a morpheme where one might otherwise be expected."
      ],
      "topics": [
        "human-sciences",
        "linguistic-morphology",
        "linguistics",
        "morphology",
        "sciences"
      ]
    }
  ],
  "word": "∅"
}

{
  "categories": [
    "Translingual entries with incorrect language header",
    "Translingual lemmas",
    "Translingual symbols",
    "Translingual terms derived from Norwegian",
    "Translingual terms with non-redundant manual script codes"
  ],
  "etymology_templates": [
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      "args": {
        "1": "mul",
        "2": "no",
        "3": "-"
      },
      "expansion": "Norwegian",
      "name": "der"
    },
    {
      "args": {
        "1": "no",
        "2": "ø",
        "3": "Ø"
      },
      "expansion": "Ø",
      "name": "l"
    }
  ],
  "etymology_text": "The set-theoretic meaning of this symbol was introduced by the Bourbaki group in their treatise Éléments de mathématique. André Weil has said in his autobiography that he based it on the Norwegian letter Ø.",
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol",
        "sc": "Zsym"
      },
      "expansion": "∅",
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    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "related": [
    {
      "english": "the zero prefix",
      "word": "∅-"
    },
    {
      "english": "the zero suffix",
      "word": "-∅"
    },
    {
      "english": "a zero prefix in Navajo",
      "word": "-∅-"
    },
    {
      "word": "null determiner"
    }
  ],
  "senses": [
    {
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      ],
      "glosses": [
        "A set with no elements: the empty set."
      ],
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        [
          "set theory",
          "set theory"
        ],
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          "empty set",
          "empty set"
        ]
      ],
      "raw_glosses": [
        "(set theory) A set with no elements: the empty set."
      ],
      "synonyms": [
        {
          "word": "{ }"
        },
        {
          "word": "{}"
        }
      ],
      "topics": [
        "mathematics",
        "sciences",
        "set-theory"
      ]
    },
    {
      "categories": [
        "mul:Linguistic morphology"
      ],
      "glosses": [
        "A null morpheme; a theoretical morpheme used in models of linguistic analysis to represent the absence of a morpheme where one might otherwise be expected."
      ],
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          "linguistic"
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          "null morpheme"
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        [
          "morpheme",
          "morpheme"
        ],
        [
          "analysis",
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        ]
      ],
      "raw_glosses": [
        "(linguistic morphology) A null morpheme; a theoretical morpheme used in models of linguistic analysis to represent the absence of a morpheme where one might otherwise be expected."
      ],
      "topics": [
        "human-sciences",
        "linguistic-morphology",
        "linguistics",
        "morphology",
        "sciences"
      ]
    }
  ],
  "word": "∅"
}