"ㄪ" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "sc": "Bopo"
      },
      "expansion": "ㄪ",
      "name": "mul-letter"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "character",
  "senses": [
    {
      "categories": [
        {
          "_dis": "65 35",
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "87 13",
          "kind": "other",
          "name": "Translingual terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "86 14",
          "kind": "other",
          "name": "Zhuyin script characters",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "type: initial"
      ],
      "id": "en-ㄪ-mul-character-87gZx4cK",
      "tags": [
        "letter"
      ]
    },
    {
      "glosses": [
        "general transliteration: v"
      ],
      "id": "en-ㄪ-mul-character-~CgoQIAT",
      "tags": [
        "letter"
      ]
    }
  ],
  "word": "ㄪ"
}

{
  "categories": [
    "Translingual entries with incorrect language header",
    "Translingual lemmas",
    "Translingual letters",
    "Translingual terms with redundant script codes",
    "Zhuyin script characters"
  ],
  "head_templates": [
    {
      "args": {
        "sc": "Bopo"
      },
      "expansion": "ㄪ",
      "name": "mul-letter"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "character",
  "senses": [
    {
      "glosses": [
        "type: initial"
      ],
      "tags": [
        "letter"
      ]
    },
    {
      "glosses": [
        "general transliteration: v"
      ],
      "tags": [
        "letter"
      ]
    }
  ],
  "word": "ㄪ"
}