a three-dimensional orthogonal coordinate system that results from rotating the two-dimensional bipolar coordinate system about the axis that separates its two foci.

inductors and transformers which use magnetic cores with a toroidal (ring or donut) shape.

The terms toroidal and poloidal refer to directions relative to a torus of reference.

A toroidal planet is a hypothetical type of telluric exoplanet with a toroidal or doughnut shape.

In electromagnetism, a toroidal moment is an independent term in the multipole expansion of electromagnetic fields besides magnetic and electric multipoles.