Donut-shaped elastic torus and its cross-section.

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evolution - What would the problems with / consequences of a torus shaped planet be? - Worldbuilding Stack Exchange

Solved A toroidal coil (also called a torus or toroid) is a

Gol'denveizer's problem of elastic torus - ScienceDirect

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Torus - Wikipedia

Shapes : Bully For You

A torus with a circular cross section: ͑ a ͒ three-dimensional view; ͑

Doughnut - Wikipedia

Takahiro TOMIOKA, Professor (Full), Doctor of Engineering, Akita Prefectural University, Akitashi, Department of Mechanical Engineering

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Torus -- from Wolfram MathWorld

Torus - Wikipedia