"m2" meaning in Translingual

{
  "etymology_text": "Due to typographic limitations.",
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "m2",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "alt_of": [
        {
          "word": "m²"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Translingual entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of m²"
      ],
      "id": "en-m2-mul-symbol--u5VNmwy",
      "links": [
        [
          "m²",
          "m²#Translingual"
        ]
      ],
      "raw_glosses": [
        "(nonstandard) Alternative form of m²"
      ],
      "tags": [
        "alt-of",
        "alternative",
        "nonstandard"
      ]
    }
  ],
  "word": "m2"
}

{
  "etymology_text": "Due to typographic limitations.",
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "m2",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "alt_of": [
        {
          "word": "m²"
        }
      ],
      "categories": [
        "Translingual entries with incorrect language header",
        "Translingual entries with language name categories using raw markup",
        "Translingual lemmas",
        "Translingual nonstandard forms",
        "Translingual nonstandard terms",
        "Translingual symbols",
        "Translingual terms spelled with numbers"
      ],
      "glosses": [
        "Alternative form of m²"
      ],
      "links": [
        [
          "m²",
          "m²#Translingual"
        ]
      ],
      "raw_glosses": [
        "(nonstandard) Alternative form of m²"
      ],
      "tags": [
        "alt-of",
        "alternative",
        "nonstandard"
      ]
    }
  ],
  "word": "m2"
}