Toroidal

Toroidal describes something which resembles or relates to a torus or toroid:

Mathematics

 * Toroidal coordinates, a three-dimensional orthogonal coordinate system
 * Toroidal and poloidal coordinates, directions for a three-dimensional system which follows a circular ring around the surface
 * Toroidal graph, a graph whose vertices can be placed on a torus such that no edges cross
 * Toroidal grid network, an n-dimensional grid connected circularly in more than one dimension
 * Toroidal polyhedron, partition of a toroidal surface into polygons

Engineering

 * Toroidal engine, an internal combustion engine with pistons that rotate inside a ring-shaped cylinder
 * Toroidal expansion joint, a metallic assembly consisting of a series of circular tubes used in high pressure applications
 * Toroidal inductors and transformers, a type of electrical device using magnetic cores with a ring or donut shape
 * Toroidal propeller, a loop-shaped propeller used in aviation and maritime transport
 * Toroidal reflector, a reflector whose surface is a section of a torus which has a different focal distance depending on the angle of the mirror

Other uses

 * Toroidal planet, planet in the shape of a toroidal or doughnut shape
 * Toroidal ring model in theoretical physics
 * Toroidal solenoid, 1946 design for a fusion power device
 * Vortex ring, also known as a toroidal vortex; a toroidal flow in fluid mechanics