"Sierpinski sponge" meaning in English

{
  "etymology_text": "Named after Wacław Sierpiński, Polish mathematician.",
  "forms": [
    {
      "form": "Sierpinski sponges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Sierpinski sponge (plural Sierpinski sponges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Fractals",
          "orig": "en:Fractals",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The three-dimensional extension of the Sierpinski carpet."
      ],
      "id": "en-Sierpinski_sponge-en-noun-y-eROVV0",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "three-dimensional",
          "three-dimensional"
        ],
        [
          "extension",
          "extension"
        ],
        [
          "Sierpinski carpet",
          "Sierpinski carpet"
        ]
      ],
      "raw_glosses": [
        "(mathematics) The three-dimensional extension of the Sierpinski carpet."
      ],
      "synonyms": [
        {
          "word": "Sierpinski cube"
        }
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Sierpinski sponge",
        "Wacław Sierpiński"
      ]
    }
  ],
  "word": "Sierpinski sponge"
}

{
  "etymology_text": "Named after Wacław Sierpiński, Polish mathematician.",
  "forms": [
    {
      "form": "Sierpinski sponges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Sierpinski sponge (plural Sierpinski sponges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English entries with topic categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Fractals",
        "en:Mathematics"
      ],
      "glosses": [
        "The three-dimensional extension of the Sierpinski carpet."
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "three-dimensional",
          "three-dimensional"
        ],
        [
          "extension",
          "extension"
        ],
        [
          "Sierpinski carpet",
          "Sierpinski carpet"
        ]
      ],
      "raw_glosses": [
        "(mathematics) The three-dimensional extension of the Sierpinski carpet."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Sierpinski sponge",
        "Wacław Sierpiński"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Sierpinski cube"
    }
  ],
  "word": "Sierpinski sponge"
}