Duocylinder

Rarity: Common

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What Wikipedia says

The duocylinder, also called the double cylinder or the bidisc, is a geometric object embedded in 4-dimensional Euclidean space, defined as the Cartesian product of two disks of respective radii r1 and r2:

Excerpt from the Wikipedia article “Duocylinder”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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