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 Torus 

In geometry, a torus is a solid of revolution[?] generated by revolving a circle about an axis coplanar with the circle. The sphere is a special case of the torus obtained when the axis of rotation is a diameter of the circle. If the axis of rotation doesn't intersect the circle, the torus has a hole in the middle and resembles a ring doughnut, a hula hoop or an inflated tyre (U.S. tire). The other case, when the axis of rotation is a chord of the circle, produces a sort of squashed sphere resembling a round cushion. Torus was the Latin word for a cushion of this shape.

According to the broadest definition, the generator of a torus need not be a circle but could also be an ellipse or any other conic section.

In topology torus means the product of a number of circles, the surface of a doughnut shape being the product of two. (In proper mathematical usage, a solid as described above would be spoken of as generated from a disk, i.e., a filled-in circle.)

In nuclear physics a torus is a large fusion reactor which is very roughly the shape of an elliptical torus. Examples are JET in the UK, JT-60 in Japan, TFTR in the USA and the proposed ITER.

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