Viviani's curve

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Notion

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Science and technology

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What Wikipedia says

In mathematics, Viviani's curve, also known as Viviani's window, is a figure-eight-shaped space curve named after the Italian mathematician Vincenzo Viviani. It is the intersection of a sphere with a cylinder that is tangent to the sphere and passes through two poles (a diameter) of the sphere (see diagram).

Excerpt from the Wikipedia article “Viviani's curve”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Claudio Rocchini, CC BY 2.5, via Wikimedia Commons.