"Em" meaning in Translingual

{
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      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "Em",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(exametre), an SI unit of length equal to 10¹⁸ meters (metres)",
          "word": "exameter"
        }
      ],
      "categories": [
        {
          "kind": "topical",
          "name": "Symbols for SI units",
          "parents": [
            "SI units",
            "Units of measure",
            "Metrology",
            "Quantity",
            "Applied sciences",
            "Mathematics",
            "Sciences",
            "Formal sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Metrology",
          "orig": "mul:Metrology",
          "parents": [
            "Applied sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "_dis": "83 6 11",
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Symbol for exameter (exametre), an SI unit of length equal to 10¹⁸ meters (metres)."
      ],
      "id": "en-Em-mul-symbol-qkR7kLzB",
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "exameter",
          "exameter"
        ],
        [
          "exametre",
          "exametre"
        ],
        [
          "length",
          "length"
        ],
        [
          "meter",
          "meter"
        ],
        [
          "metre",
          "metre"
        ]
      ],
      "raw_glosses": [
        "(metrology) Symbol for exameter (exametre), an SI unit of length equal to 10¹⁸ meters (metres)."
      ],
      "tags": [
        "alt-of",
        "symbol"
      ],
      "topics": [
        "metrology"
      ]
    },
    {
      "categories": [],
      "glosses": [
        "emanation"
      ],
      "id": "en-Em-mul-symbol-wOd-roFo",
      "links": [
        [
          "emanation",
          "emanation"
        ]
      ],
      "qualifier": "chemical symbol",
      "raw_glosses": [
        "(chemical symbol, dated) emanation"
      ],
      "tags": [
        "dated"
      ]
    },
    {
      "alt_of": [
        {
          "word": "E minor"
        }
      ],
      "categories": [
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Music",
          "orig": "mul:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Symbol for E minor."
      ],
      "id": "en-Em-mul-symbol-1a5y5TbZ",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "E minor",
          "E minor"
        ]
      ],
      "raw_glosses": [
        "(music) Symbol for E minor."
      ],
      "tags": [
        "alt-of",
        "symbol"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "Em"
}

{
  "categories": [
    "Pages with 3 entries",
    "Pages with entries",
    "Translingual entries with incorrect language header",
    "Translingual lemmas",
    "Translingual symbols"
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  "head_templates": [
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      "expansion": "Em",
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  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "(exametre), an SI unit of length equal to 10¹⁸ meters (metres)",
          "word": "exameter"
        }
      ],
      "categories": [
        "Symbols for SI units",
        "mul:Metrology"
      ],
      "glosses": [
        "Symbol for exameter (exametre), an SI unit of length equal to 10¹⁸ meters (metres)."
      ],
      "links": [
        [
          "metrology",
          "metrology"
        ],
        [
          "exameter",
          "exameter"
        ],
        [
          "exametre",
          "exametre"
        ],
        [
          "length",
          "length"
        ],
        [
          "meter",
          "meter"
        ],
        [
          "metre",
          "metre"
        ]
      ],
      "raw_glosses": [
        "(metrology) Symbol for exameter (exametre), an SI unit of length equal to 10¹⁸ meters (metres)."
      ],
      "tags": [
        "alt-of",
        "symbol"
      ],
      "topics": [
        "metrology"
      ]
    },
    {
      "categories": [
        "Translingual dated terms"
      ],
      "glosses": [
        "emanation"
      ],
      "links": [
        [
          "emanation",
          "emanation"
        ]
      ],
      "qualifier": "chemical symbol",
      "raw_glosses": [
        "(chemical symbol, dated) emanation"
      ],
      "tags": [
        "dated"
      ]
    },
    {
      "alt_of": [
        {
          "word": "E minor"
        }
      ],
      "categories": [
        "mul:Music"
      ],
      "glosses": [
        "Symbol for E minor."
      ],
      "links": [
        [
          "music",
          "music"
        ],
        [
          "E minor",
          "E minor"
        ]
      ],
      "raw_glosses": [
        "(music) Symbol for E minor."
      ],
      "tags": [
        "alt-of",
        "symbol"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "Em"
}