# Toroidal

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> Markdown URL: https://mediated.wiki/source/Toroidal.md
> Source: https://en.wikipedia.org/wiki/Toroidal
> Source revision: 1341880179
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

**Toroidal** describes something which resembles or relates to a [torus](/source/Torus) or [toroid](/source/Toroid):

## Mathematics

- [Toroidal coordinates](/source/Toroidal_coordinates), a three-dimensional orthogonal coordinate system.
- [Toroidal and poloidal coordinates](/source/Toroidal_and_poloidal_coordinates), directions for a three-dimensional system which follows a circular ring around the surface.
- [Toroidal graph](/source/Toroidal_graph), a graph whose vertices can be placed on a torus such that no edges cross.
- Toroidal [grid network](/source/Grid_network), an un-dimensional grid connected circularly in more than one dimension.
- [Toroidal polyhedron](/source/Toroidal_polyhedron), partition of a toroidal surface into polygons.
- [Tensor ring decomposition](/source/Tensor_ring_decomposition), a fundamental numerical model representing high-dimensional tensors through circular multilinear products of low-dimensional cores.

## Engineering

- [Toroidal engine](/source/Toroidal_engine), an internal combustion engine with pistons that rotate inside a ring-shaped cylinder
- [Toroidal expansion joint](/source/Toroidal_expansion_joint), a metallic assembly consisting of a series of circular tubes used in high pressure applications
- [Toroidal inductors and transformers](/source/Toroidal_inductors_and_transformers), a type of electrical device using magnetic cores with a ring or donut shape
- [Toroidal propeller](/source/Toroidal_propeller), a loop-shaped propeller used in aviation and maritime transport
- [Toroidal reflector](/source/Toroidal_reflector), a section of a torus with varying focal distances depending on the mirror angle.
- [Tensor Ring](/source/Tensor_Ring), a closed-loop device (often copper) utilizing cubit-length geometry to generate a stabilized energy column or coherent tensor field.

## Other uses

- [Toroidal planet](/source/Toroidal_planet), a hypothetical planet in the shape of a doughnut.
- [Toroidal ring model](/source/Toroidal_ring_model), used in theoretical physics to describe particles and photons as fundamental toroids.
- [Toroidal solenoid](/source/Toroidal_solenoid), a 1946 design for a fusion power device.
- [Vortex ring](/source/Vortex_ring), also known as a toroidal vortex; a toroidal flow in fluid. Essentially, A Vortex Ring is a region of rotating movement in a toroid shape found in smoke rings, bubble rings, and the bio-magnetic fields of marine biology.
- [Electroculture antenna](/source/Electroculture_antenna), a geometric conduit, such as a Fibonacci spiral, designed to tune terrestrial soil to the atmospheric potential gradient of the "planetary battery".

## See also

- [Atoroidal](/source/Atoroidal)
- [Torus (disambiguation)](/source/Torus_(disambiguation))
- [Sacred Geometry](/source/Sacred_Geometry)
- [Oligodynamic effect](/source/Oligodynamic_effect)

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Adapted from the Wikipedia article [Toroidal](https://en.wikipedia.org/wiki/Toroidal) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Toroidal?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.