"15mb" meaning in All languages combined

{
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        "2": "it",
        "3": "quindicesima bassa",
        "4": "",
        "5": "fifteenth lower"
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      "expansion": "Italian quindicesima bassa (“fifteenth lower”)",
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      "expansion": "Italian quindicesima alta (“fifteenth higher”)",
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  ],
  "etymology_text": "From Italian quindicesima bassa (“fifteenth lower”), by analogy with 15ma interpreted as an abbreviation of Italian quindicesima alta (“fifteenth higher”).",
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  "lang_code": "mul",
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  "senses": [
    {
      "categories": [
        {
          "kind": "other",
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        },
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          "kind": "topical",
          "langcode": "mul",
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      "glosses": [
        "An instruction to play two octaves lower than indicated."
      ],
      "id": "en-15mb-mul-symbol-2pnrjDIf",
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          "music",
          "music"
        ],
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        "(music, very rare) An instruction to play two octaves lower than indicated."
      ],
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        "entertainment",
        "lifestyle",
        "music"
      ],
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        "15mb"
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      "expansion": "Italian quindicesima alta (“fifteenth higher”)",
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      "word": "8va"
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        "An instruction to play two octaves lower than indicated."
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        "(music, very rare) An instruction to play two octaves lower than indicated."
      ],
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