torus

/ˈtɔːɹəs/

noun

A topological space which is a product of two circles.
"A 4-variable Karnaugh map can be thought of, topologically, as being a torus."
The standard representation of such a space in 3-dimensional Euclidean space: a shape consisting of a ring with a circular cross-section: the shape of an inner tube or hollow doughnut.
(in combination, n-torus, 4-torus, etc.) The product of the specified number of circles.

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