torus

US /ˈtɔː.rəs/
UK /ˈtɔː.rəs/
"torus" picture
1.

toro, anel

a surface or solid formed by revolving a circle about a line that is in the same plane as the circle but does not intersect it (as a doughnut or a ring)

:
The mathematical model represented the magnetic field as a torus.
O modelo matemático representava o campo magnético como um toro.
Doughnuts are a common example of a torus shape.
Donuts são um exemplo comum de uma forma de toro.