"XXXX" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "numeral symbol",
        "cat2": "",
        "sc": "Latn",
        "sort": ""
      },
      "expansion": "XXXX",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "XXXX",
      "name": "mul-number"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "num",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Translingual entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "name": "Translingual numeral symbols",
          "parents": [
            "Numeral symbols",
            "Symbols",
            "Letters, symbols, and punctuation",
            "Orthography",
            "Writing",
            "Human behaviour",
            "Language",
            "Human",
            "Communication",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Translingual terms with 3 consecutive instances of the same letter",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Translingual terms with 4 consecutive instances of the same letter",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Translingual terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "40 24 0 36",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "39 34 0 28",
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "34 27 0 39",
          "kind": "other",
          "name": "English terms with 3 consecutive instances of the same letter",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "34 27 0 39",
          "kind": "other",
          "name": "English terms with 4 consecutive instances of the same letter",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A Roman numeral representing forty (40) in the (now non-standard) \"additive\" form; now replaced by the form XL."
      ],
      "id": "en-XXXX-mul-num-ms0KTwdt",
      "links": [
        [
          "forty",
          "forty"
        ],
        [
          "40",
          "40"
        ]
      ],
      "raw_tags": [
        "number"
      ],
      "related": [
        {
          "word": "4X"
        },
        {
          "english": "thirty-nine, 39",
          "sense": "Previous",
          "word": "XXXIX"
        },
        {
          "english": "forty-one, 41",
          "sense": "Next",
          "word": "XLI"
        }
      ],
      "synonyms": [
        {
          "sense": "roman numeral",
          "word": "xxxx"
        },
        {
          "sense": "roman numeral",
          "word": "XL"
        },
        {
          "sense": "roman numeral",
          "word": "xl"
        }
      ]
    }
  ],
  "word": "XXXX"
}

{
  "categories": [
    "English 4-syllable words",
    "English adjectives",
    "English entries with incorrect language header",
    "English entries with language name categories using raw markup",
    "English lemmas",
    "English reduplicated coordinated quadruples",
    "English terms with 3 consecutive instances of the same letter",
    "English terms with 4 consecutive instances of the same letter",
    "English terms with IPA pronunciation",
    "Rhymes:English/ɛks",
    "Rhymes:English/ɛks/4 syllables"
  ],
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "numeral symbol",
        "cat2": "",
        "sc": "Latn",
        "sort": ""
      },
      "expansion": "XXXX",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "XXXX",
      "name": "mul-number"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "num",
  "related": [
    {
      "word": "4X"
    },
    {
      "english": "thirty-nine, 39",
      "sense": "Previous",
      "word": "XXXIX"
    },
    {
      "english": "forty-one, 41",
      "sense": "Next",
      "word": "XLI"
    }
  ],
  "senses": [
    {
      "categories": [
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual numeral symbols",
        "Translingual terms with 3 consecutive instances of the same letter",
        "Translingual terms with 4 consecutive instances of the same letter",
        "Translingual terms with redundant script codes"
      ],
      "glosses": [
        "A Roman numeral representing forty (40) in the (now non-standard) \"additive\" form; now replaced by the form XL."
      ],
      "links": [
        [
          "forty",
          "forty"
        ],
        [
          "40",
          "40"
        ]
      ],
      "raw_tags": [
        "number"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "roman numeral",
      "word": "xxxx"
    },
    {
      "sense": "roman numeral",
      "word": "XL"
    },
    {
      "sense": "roman numeral",
      "word": "xl"
    }
  ],
  "word": "XXXX"
}