"b̦" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "letter"
      },
      "expansion": "b̦",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "character",
  "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": "other",
          "name": "UPA symbols",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "a voiced labiodental plosive (IPA [b̪])."
      ],
      "id": "en-b̦-mul-character-oT7yh3e2",
      "raw_glosses": [
        "(UPA) a voiced labiodental plosive (IPA [b̪])."
      ],
      "tags": [
        "UPA",
        "letter"
      ]
    }
  ],
  "word": "b̦"
}

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "letter"
      },
      "expansion": "b̦",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "character",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual letters",
        "Translingual terms spelled with ◌̦",
        "UPA symbols"
      ],
      "glosses": [
        "a voiced labiodental plosive (IPA [b̪])."
      ],
      "raw_glosses": [
        "(UPA) a voiced labiodental plosive (IPA [b̪])."
      ],
      "tags": [
        "UPA",
        "letter"
      ]
    }
  ],
  "word": "b̦"
}