"mus." meaning in Swedish

{
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "noun"
      },
      "expansion": "mus.",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "musik"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Swedish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "sv",
          "name": "Lexicography",
          "orig": "sv:Lexicography",
          "parents": [
            "Linguistics",
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "music; Abbreviation of musik."
      ],
      "id": "en-mus.-sv-noun-gXS1jiTM",
      "links": [
        [
          "lexicography",
          "lexicography"
        ],
        [
          "music",
          "music"
        ],
        [
          "musik",
          "musik#Swedish"
        ]
      ],
      "raw_glosses": [
        "(lexicography) music; Abbreviation of musik."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "human-sciences",
        "lexicography",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "word": "mus."
}

{
  "head_templates": [
    {
      "args": {
        "1": "sv",
        "2": "noun"
      },
      "expansion": "mus.",
      "name": "head"
    }
  ],
  "lang": "Swedish",
  "lang_code": "sv",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "musik"
        }
      ],
      "categories": [
        "Pages with 2 entries",
        "Swedish abbreviations",
        "Swedish entries with incorrect language header",
        "Swedish lemmas",
        "Swedish nouns",
        "Swedish terms spelled with .",
        "sv:Lexicography"
      ],
      "glosses": [
        "music; Abbreviation of musik."
      ],
      "links": [
        [
          "lexicography",
          "lexicography"
        ],
        [
          "music",
          "music"
        ],
        [
          "musik",
          "musik#Swedish"
        ]
      ],
      "raw_glosses": [
        "(lexicography) music; Abbreviation of musik."
      ],
      "tags": [
        "abbreviation",
        "alt-of"
      ],
      "topics": [
        "human-sciences",
        "lexicography",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "word": "mus."
}