"Hàn" meaning in Mandarin

{
  "forms": [
    {
      "form": "ㄏㄢˋ",
      "tags": [
        "bopomofo"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Hàn (han⁴, Zhuyin ㄏㄢˋ)",
      "name": "cmn-pinyin"
    }
  ],
  "lang": "Mandarin",
  "lang_code": "cmn",
  "pos": "romanization",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Hanyu Pinyin",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mandarin terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "23 27 19 19 5 8",
          "kind": "other",
          "name": "Sino-Vietnamese words",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Hanyu Pinyin reading of 漢／汉"
      ],
      "id": "en-Hàn-cmn-romanization--wdqj3Yv",
      "links": [
        [
          "Hanyu Pinyin",
          "Hanyu Pinyin"
        ],
        [
          "漢",
          "漢#Chinese"
        ],
        [
          "汉",
          "汉#Chinese"
        ]
      ]
    }
  ],
  "word": "Hàn"
}

{
  "categories": [
    "Sino-Vietnamese words"
  ],
  "forms": [
    {
      "form": "ㄏㄢˋ",
      "tags": [
        "bopomofo"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Hàn (han⁴, Zhuyin ㄏㄢˋ)",
      "name": "cmn-pinyin"
    }
  ],
  "lang": "Mandarin",
  "lang_code": "cmn",
  "pos": "romanization",
  "senses": [
    {
      "categories": [
        "Hanyu Pinyin",
        "Mandarin entries with incorrect language header",
        "Mandarin non-lemma forms",
        "Mandarin terms with redundant script codes"
      ],
      "glosses": [
        "Hanyu Pinyin reading of 漢／汉"
      ],
      "links": [
        [
          "Hanyu Pinyin",
          "Hanyu Pinyin"
        ],
        [
          "漢",
          "漢#Chinese"
        ],
        [
          "汉",
          "汉#Chinese"
        ]
      ]
    }
  ],
  "word": "Hàn"
}

{
  "called_from": "form_descriptions/1698",
  "msg": "unrecognized head form: han⁴",
  "path": [
    "Hàn"
  ],
  "section": "Mandarin",
  "subsection": "romanization",
  "title": "Hàn",
  "trace": ""
}