"Latn" meaning in Translingual

{
  "etymology_templates": [
    {
      "args": {
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        "2": "en",
        "3": "Latin"
      },
      "expansion": "English Latin",
      "name": "der"
    },
    {
      "args": {
        "1": "mul",
        "2": "la",
        "3": "latīnus"
      },
      "expansion": "Latin latīnus",
      "name": "der"
    }
  ],
  "etymology_text": "From English Latin, from Latin latīnus, from Latium (“the region around Rome”) + -īnus (“adjective suffix”).\nThe letter \"i\" was trimmed from \"Latin\", in accordance with the four-letter format in ISO 15924.",
  "head_templates": [
    {
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        "1": "mul",
        "2": "proper noun"
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      "expansion": "Latn",
      "name": "head"
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  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
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          "parents": [
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "mul",
          "name": "Writing systems",
          "orig": "mul:Writing systems",
          "parents": [
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "ISO 15924 for Latin script."
      ],
      "id": "en-Latn-mul-name--4UzP8Pw",
      "links": [
        [
          "Latin",
          "Latin"
        ]
      ]
    }
  ],
  "word": "Latn"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "mul",
        "2": "en",
        "3": "Latin"
      },
      "expansion": "English Latin",
      "name": "der"
    },
    {
      "args": {
        "1": "mul",
        "2": "la",
        "3": "latīnus"
      },
      "expansion": "Latin latīnus",
      "name": "der"
    }
  ],
  "etymology_text": "From English Latin, from Latin latīnus, from Latium (“the region around Rome”) + -īnus (“adjective suffix”).\nThe letter \"i\" was trimmed from \"Latin\", in accordance with the four-letter format in ISO 15924.",
  "head_templates": [
    {
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      "expansion": "Latn",
      "name": "head"
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  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual proper nouns",
        "Translingual terms derived from English",
        "Translingual terms derived from Latin",
        "mul:Writing systems"
      ],
      "glosses": [
        "ISO 15924 for Latin script."
      ],
      "links": [
        [
          "Latin",
          "Latin"
        ]
      ]
    }
  ],
  "word": "Latn"
}