It is a geometrical figure like a donut or a donut. It is the product of a closed curve rotating about its axis. Ring, ring, rings, threads.
Also Bull, geometric figure contained by a tubular circular surface with the shape of a doughnut, a donut, the Chamber of a tire or a ring float. Some say that the universe has a structure and gigantic Toroid shape.
TOROID: IN GEOMETRY, SURFACE PRODUCED BY A CLOSED CURVE.