"ᴹ⁷" meaning in Translingual

{
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    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "ᴹ⁷",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Music",
          "orig": "mul:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An indicator that a seventh chord is major."
      ],
      "id": "en-ᴹ⁷-mul-symbol-6GK1flKB",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "seventh chord",
          "seventh chord#English"
        ],
        [
          "major",
          "major seventh chord#English"
        ]
      ],
      "raw_glosses": [
        "(music) An indicator that a seventh chord is major."
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "ᴹ⁷"
}

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol"
      },
      "expansion": "ᴹ⁷",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual symbols",
        "Translingual terms spelled with ᴹ",
        "Translingual terms spelled with ⁷",
        "mul:Music"
      ],
      "glosses": [
        "An indicator that a seventh chord is major."
      ],
      "links": [
        [
          "music",
          "music"
        ],
        [
          "seventh chord",
          "seventh chord#English"
        ],
        [
          "major",
          "major seventh chord#English"
        ]
      ],
      "raw_glosses": [
        "(music) An indicator that a seventh chord is major."
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "ᴹ⁷"
}