The three-torus model is a cosmological model proposed in 1984 by Alexei Starobinsky and Yakov Borisovich Zel'dovich at the Landau Institute in Moscow. The theory describes the shape of the universe (topology) as a three-dimensional torus.
In connection with that, the torus is the only surface covered by the plane and therefore supports a flat Riemannian metric. Tori with multiple holes support a hyperbolic or negatively curved metric, which has become immensely important for our understanding of geometry, algebra and physics.
The toroidal field is like an energy field that is shaped like a doughnut (hence the shape of a toroid). It is an energy field and can be used to model how energy moves in its most balanced dynamic process. Toroidal fields are everywhere, from hurricanes to tornadoes to magnetic fields around stars and other celestial bodies (see photo for examples).