"Bn." meaning in English

{
  "forms": [
    {
      "form": "Bn.",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "Bn."
      },
      "expansion": "Bn. (plural Bn.)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "bassoon"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
          "parents": [
            "Art",
            "Sound",
            "Culture",
            "Energy",
            "Society",
            "Nature",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Abbreviation of bassoon."
      ],
      "id": "en-Bn.-en-noun-tIRSvAaZ",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "bassoon",
          "bassoon#English"
        ]
      ],
      "raw_glosses": [
        "(music) Abbreviation of bassoon."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "Bn."
}

{
  "forms": [
    {
      "form": "Bn.",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "Bn."
      },
      "expansion": "Bn. (plural Bn.)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "bassoon"
        }
      ],
      "categories": [
        "English abbreviations",
        "English countable nouns",
        "English entries with incorrect language header",
        "English indeclinable nouns",
        "English lemmas",
        "English nouns",
        "English nouns with irregular plurals",
        "English terms spelled with .",
        "English words without vowels",
        "en:Music"
      ],
      "glosses": [
        "Abbreviation of bassoon."
      ],
      "links": [
        [
          "music",
          "music"
        ],
        [
          "bassoon",
          "bassoon#English"
        ]
      ],
      "raw_glosses": [
        "(music) Abbreviation of bassoon."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "Bn."
}