"三疊紀" meaning in Japanese

{
  "forms": [
    {
      "form": "三疊紀",
      "ruby": [
        [
          "三",
          "さん"
        ],
        [
          "疊",
          "じょう"
        ],
        [
          "紀",
          "き"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "Sanjōki",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "sandefuki",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "さんでふき",
      "roman": "sandefuki",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "proper",
        "2": "さんじょうき",
        "hhira": "さんでふき"
      },
      "expansion": "三(さん)疊(じょう)紀(き) • (Sanjōki) ^(←さんでふき (sandefuki)?)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese kyūjitai spellings",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "the Triassic period",
          "word": "三畳紀"
        }
      ],
      "glosses": [
        "Kyūjitai form of 三畳紀 (“the Triassic period”)"
      ],
      "id": "en-三疊紀-ja-name-e71AI~vM",
      "links": [
        [
          "Kyūjitai",
          "kyūjitai"
        ],
        [
          "三畳紀",
          "三畳紀#Japanese"
        ],
        [
          "Triassic",
          "Triassic"
        ],
        [
          "period",
          "period"
        ]
      ],
      "tags": [
        "form-of",
        "kyūjitai"
      ]
    }
  ],
  "word": "三疊紀"
}

{
  "forms": [
    {
      "form": "三疊紀",
      "ruby": [
        [
          "三",
          "さん"
        ],
        [
          "疊",
          "じょう"
        ],
        [
          "紀",
          "き"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "Sanjōki",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "sandefuki",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "さんでふき",
      "roman": "sandefuki",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "proper",
        "2": "さんじょうき",
        "hhira": "さんでふき"
      },
      "expansion": "三(さん)疊(じょう)紀(き) • (Sanjōki) ^(←さんでふき (sandefuki)?)",
      "name": "ja-pos"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Japanese entries with incorrect language header",
        "Japanese kyūjitai spellings",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese proper nouns",
        "Japanese terms spelled with fifth grade kanji",
        "Japanese terms spelled with first grade kanji",
        "Japanese terms spelled with jinmeiyō kanji",
        "Japanese terms with redundant sortkeys",
        "Japanese terms written with three Han script characters"
      ],
      "form_of": [
        {
          "extra": "the Triassic period",
          "word": "三畳紀"
        }
      ],
      "glosses": [
        "Kyūjitai form of 三畳紀 (“the Triassic period”)"
      ],
      "links": [
        [
          "Kyūjitai",
          "kyūjitai"
        ],
        [
          "三畳紀",
          "三畳紀#Japanese"
        ],
        [
          "Triassic",
          "Triassic"
        ],
        [
          "period",
          "period"
        ]
      ],
      "tags": [
        "form-of",
        "kyūjitai"
      ]
    }
  ],
  "word": "三疊紀"
}

{
  "called_from": "parser/304",
  "msg": "HTML tag <span> not properly closed",
  "path": [
    "三疊紀"
  ],
  "section": "Japanese",
  "subsection": "proper noun",
  "title": "三疊紀",
  "trace": "started on line 2, detected on line 2"
}

{
  "called_from": "parser/1336",
  "msg": "no corresponding start tag found for </span>",
  "path": [
    "三疊紀"
  ],
  "section": "Japanese",
  "subsection": "proper noun",
  "title": "三疊紀",
  "trace": ""
}