"XCIX" meaning in Translingual

{
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "numeral symbol"
      },
      "expansion": "XCIX",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "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": [
            "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"
        }
      ],
      "coordinate_terms": [
        {
          "sense": "Previous",
          "word": "XCVIII"
        },
        {
          "sense": "Next",
          "word": "C (100)"
        }
      ],
      "glosses": [
        "A Roman numeral representing ninety-nine (99)."
      ],
      "id": "en-XCIX-mul-symbol-xJYD-9Vg",
      "links": [
        [
          "Roman numeral",
          "Roman numeral"
        ],
        [
          "ninety-nine",
          "ninety-nine"
        ]
      ]
    }
  ],
  "word": "XCIX"
}

{
  "coordinate_terms": [
    {
      "sense": "Previous",
      "word": "XCVIII"
    },
    {
      "sense": "Next",
      "word": "C (100)"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mul",
        "2": "numeral symbol"
      },
      "expansion": "XCIX",
      "name": "head"
    }
  ],
  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "symbol",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Roman numerals",
        "Translingual entries with incorrect language header",
        "Translingual lemmas",
        "Translingual numeral symbols"
      ],
      "glosses": [
        "A Roman numeral representing ninety-nine (99)."
      ],
      "links": [
        [
          "Roman numeral",
          "Roman numeral"
        ],
        [
          "ninety-nine",
          "ninety-nine"
        ]
      ]
    }
  ],
  "word": "XCIX"
}

{
  "called_from": "linkages/674",
  "msg": "parenthesized number but there is no sense with such index: 98",
  "path": [
    "XCIX"
  ],
  "section": "Translingual",
  "subsection": "symbol",
  "title": "XCIX",
  "trace": ""
}