"unit sphere" meaning in English

{
  "forms": [
    {
      "form": "unit spheres",
      "tags": [
        "plural"
      ]
    }
  ],
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    {
      "args": {},
      "expansion": "unit sphere (plural unit spheres)",
      "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"
        },
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          "kind": "other",
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          "parents": [],
          "source": "w"
        },
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          "kind": "other",
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          "kind": "topical",
          "langcode": "en",
          "name": "Shapes",
          "orig": "en:Shapes",
          "parents": [
            "Geometry",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Sphere",
          "orig": "en:Sphere",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Surfaces",
          "orig": "en:Surfaces",
          "parents": [
            "Shapes",
            "Geometry",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A sphere with a radius of 1 unit."
      ],
      "id": "en-unit_sphere-en-noun-CUQJHcv-",
      "links": [
        [
          "sphere",
          "sphere"
        ],
        [
          "radius",
          "radius"
        ]
      ],
      "related": [
        {
          "word": "unit ball"
        },
        {
          "word": "unit circle"
        },
        {
          "word": "unit vector"
        }
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "sphere of radius 1",
          "tags": [
            "feminine"
          ],
          "word": "Einheitssphäre"
        }
      ],
      "wikipedia": [
        "unit sphere"
      ]
    }
  ],
  "word": "unit sphere"
}

{
  "forms": [
    {
      "form": "unit spheres",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "unit sphere (plural unit spheres)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "unit ball"
    },
    {
      "word": "unit circle"
    },
    {
      "word": "unit vector"
    }
  ],
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with German translations",
        "en:Shapes",
        "en:Sphere",
        "en:Surfaces"
      ],
      "glosses": [
        "A sphere with a radius of 1 unit."
      ],
      "links": [
        [
          "sphere",
          "sphere"
        ],
        [
          "radius",
          "radius"
        ]
      ],
      "wikipedia": [
        "unit sphere"
      ]
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "sphere of radius 1",
      "tags": [
        "feminine"
      ],
      "word": "Einheitssphäre"
    }
  ],
  "word": "unit sphere"
}