"MB" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol",
        "sc": "Zsym"
      },
      "expansion": "MB",
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    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 5 entries",
          "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": "other",
          "name": "Translingual terms with non-redundant manual script codes",
          "parents": [
            "Terms with non-redundant manual script codes",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Alchemy",
          "orig": "mul:Alchemy",
          "parents": [
            "Forteana",
            "Obsolete scientific theories",
            "Pseudoscience",
            "History of science",
            "Sciences",
            "History",
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            "Fundamental"
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          "source": "w"
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      ],
      "glosses": [
        "abbreviation for bath of Mary, balneum mariae"
      ],
      "id": "en-MB-mul-symbol-5VubNDyG",
      "links": [
        [
          "alchemy",
          "alchemy"
        ],
        [
          "bath of Mary",
          "bath of Mary"
        ],
        [
          "balneum",
          "balneum#Latin"
        ],
        [
          "mariae",
          "mariae#Latin"
        ]
      ],
      "raw_glosses": [
        "(alchemy, archaic) abbreviation for bath of Mary, balneum mariae"
      ],
      "tags": [
        "archaic"
      ],
      "topics": [
        "alchemy",
        "pseudoscience"
      ]
    }
  ],
  "word": "MB"
}

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "symbol",
        "sc": "Zsym"
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      "expansion": "MB",
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    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        "Pages with 5 entries",
        "Pages with entries",
        "Translingual entries with incorrect language header",
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        "mul:Alchemy"
      ],
      "glosses": [
        "abbreviation for bath of Mary, balneum mariae"
      ],
      "links": [
        [
          "alchemy",
          "alchemy"
        ],
        [
          "bath of Mary",
          "bath of Mary"
        ],
        [
          "balneum",
          "balneum#Latin"
        ],
        [
          "mariae",
          "mariae#Latin"
        ]
      ],
      "raw_glosses": [
        "(alchemy, archaic) abbreviation for bath of Mary, balneum mariae"
      ],
      "tags": [
        "archaic"
      ],
      "topics": [
        "alchemy",
        "pseudoscience"
      ]
    }
  ],
  "word": "MB"
}