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Torus - Wikipedia, the free encyclopedia
In geometry, a torus (pl. tori) is a surface of revolution generated by revolving a circle in three dimensional space about an axis coplanar with the circle, which does not touch ...
Torus -- from Wolfram MathWorld
An (ordinary) torus is a surface having genus one, and therefore possessing a single "hole" (left figure). The single-holed "ring" torus is known in older literature as an "anchor ...
Torus Games
Developers of Max Steel and Hello Kitty.

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Torus, in geometry, a surface generated by rotating a circle around an axis that is in the plane of the circle, but that does not intersect the circle. Common examples of tori are a doughnut, the inner tube of an inflatable tire, and the surface formed by bending a cylinder into a ring. The surface area of a torus equals 4p²kr, and the volume equals 2p²kr², where r is the radius of the rotating circle and k is the distance from the center of the rotating circle to the axis of rotation.