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 filledin 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, JT60 in Japan, TFTR in the USA and the proposed ITER.
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