Toroid (geometry)

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An example of a topological torus--surface shown a torus; the interior solid is topologically a toroid.

In mathematics, a toroid is a doughnut-shaped object. The surface of such an object is known as a torus. Its annular shape is generated by revolving a circle around an axis external to the circle.

[edit] Patents

• U.S. Patent 4,429,656  Toroidal shaped closed chamber whistle. February 7, 1984.
• U.S. Patent 4,686,928  Toroidal whistle. August 18, 1987.

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