Shape like a donut or lifeboy fading out in a wireframe structure.
A toroid is a figure shaped like a donutLucasVB Public Domain
Drawing of the a cylindrical solid core structure surrounded by seven oblong toroidal shaped structures evenly spaced with one long end of the oblong toroid facing the solid cylindrical core.
Toroids can be elongated like the eight magnets that are imbedded in the ATLAS detector© CERN