"Hn." meaning in English

{
  "forms": [
    {
      "form": "Hn.",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "Hn."
      },
      "expansion": "Hn. (plural Hn.)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "French horn"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "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 French horn."
      ],
      "id": "en-Hn.-en-noun-18IbwbnP",
      "links": [
        [
          "music",
          "music"
        ],
        [
          "French horn",
          "French horn#English"
        ]
      ],
      "raw_glosses": [
        "(music) Abbreviation of French horn."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "Hn."
}

{
  "forms": [
    {
      "form": "Hn.",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "Hn."
      },
      "expansion": "Hn. (plural Hn.)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "French horn"
        }
      ],
      "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",
        "Pages with 2 entries",
        "Pages with entries",
        "en:Music"
      ],
      "glosses": [
        "Abbreviation of French horn."
      ],
      "links": [
        [
          "music",
          "music"
        ],
        [
          "French horn",
          "French horn#English"
        ]
      ],
      "raw_glosses": [
        "(music) Abbreviation of French horn."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "entertainment",
        "lifestyle",
        "music"
      ]
    }
  ],
  "word": "Hn."
}