".mp3" meaning in Translingual

{
  "etymology_templates": [
    {
      "args": {
        "1": "mul",
        "2": "en",
        "3": "MP3"
      },
      "expansion": "English MP3",
      "name": "der"
    },
    {
      "args": {
        "1": "mul",
        "2": "w:MPEG Audio Layer 3",
        "nocap": "1",
        "nocat": "1"
      },
      "expansion": "initialism of MPEG Audio Layer 3",
      "name": "init"
    }
  ],
  "etymology_text": "From English MP3, initialism of MPEG Audio Layer 3.",
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "noun"
      },
      "expansion": ".mp3",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "noun",
  "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": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "mul",
          "name": "File formats",
          "orig": "mul:File formats",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "An extension for MP3 files."
      ],
      "id": "en-.mp3-mul-noun-buljuzht",
      "links": [
        [
          "MP3",
          "MP3"
        ]
      ]
    }
  ],
  "word": ".mp3"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "mul",
        "2": "en",
        "3": "MP3"
      },
      "expansion": "English MP3",
      "name": "der"
    },
    {
      "args": {
        "1": "mul",
        "2": "w:MPEG Audio Layer 3",
        "nocap": "1",
        "nocat": "1"
      },
      "expansion": "initialism of MPEG Audio Layer 3",
      "name": "init"
    }
  ],
  "etymology_text": "From English MP3, initialism of MPEG Audio Layer 3.",
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "noun"
      },
      "expansion": ".mp3",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual nouns",
        "Translingual terms derived from English",
        "Translingual terms spelled with .",
        "Translingual terms spelled with numbers",
        "mul:File formats"
      ],
      "glosses": [
        "An extension for MP3 files."
      ],
      "links": [
        [
          "MP3",
          "MP3"
        ]
      ]
    }
  ],
  "word": ".mp3"
}