"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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "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 eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "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"
}