"número romano" meaning in Spanish

{
  "forms": [
    {
      "form": "números romanos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "número romano m (plural números romanos)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Roman numeral (number of a system using the letters I, V, X, L, C, D and M)"
      ],
      "id": "en-número_romano-es-noun-iIagVOke",
      "links": [
        [
          "Roman numeral",
          "Roman numeral"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "número romano"
}

{
  "forms": [
    {
      "form": "números romanos",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "número romano m (plural números romanos)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 2 entries",
        "Pages with entries",
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish masculine nouns",
        "Spanish multiword terms",
        "Spanish nouns"
      ],
      "glosses": [
        "Roman numeral (number of a system using the letters I, V, X, L, C, D and M)"
      ],
      "links": [
        [
          "Roman numeral",
          "Roman numeral"
        ]
      ],
      "tags": [
        "masculine"
      ]
    }
  ],
  "word": "número romano"
}