"nv" meaning in 跨語言

{
  "lang": "跨語言",
  "lang_code": "mul",
  "pos": "symbol",
  "pos_title": "符號",
  "senses": [
    {
      "glosses": [
        "納瓦霍語在ISO 639-1語言代碼裏的編號。"
      ],
      "id": "zh-nv-mul-symbol-78f3om5Z"
    }
  ],
  "tags": [
    "error-lua-exec"
  ],
  "word": "nv"
}

{
  "lang": "跨語言",
  "lang_code": "mul",
  "pos": "symbol",
  "pos_title": "符號",
  "senses": [
    {
      "glosses": [
        "納瓦霍語在ISO 639-1語言代碼裏的編號。"
      ]
    }
  ],
  "tags": [
    "error-lua-exec"
  ],
  "word": "nv"
}

{
  "called_from": "luaexec/683",
  "msg": "LUA error in #invoke('headword/templates', 'head_t') parent ('Template:Head', {1: '跨語言', 2: '符號'})",
  "path": [
    "nv",
    "Template:head",
    "#invoke",
    "#invoke"
  ],
  "section": "跨語言",
  "subsection": "符號",
  "title": "nv",
  "trace": "[string \"Module:parameters\"]:610: Parameter 1 must be a valid language  or  etymology language code; the value \"跨語言\" is not valid. See [[WT:LOL]]  and  [[WT:LOL/E]]."
}