Torsion
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Torsion may refer to:
- In geometry:
- Torsion of a curve
- Torsion tensor in differential geometry
- The closely related concepts of Reidemeister torsion (also called R-torsion, Franz torsion, de Rham torsion) and analytic torsion (also called Ray-Singer torsion)
- Whitehead torsion
- Dihedral angle
- In algebra:
- In medicine:
- Of bones, "torsion fracture" is another term for spiral fracture.
- Of organs, torsion refers to twisting, in particular twisting that interrupts the blood supply to that organ, e.g. splenic torsion, ovarian torsion, or testicular torsion.
- Torsion of the digestive tract in some domestic animals:
- A type of horse colic
- A complication of gastric dilatation volvulus (gastric torsion)
- In physics and engineering:
- In science and pseudoscience
- Torsion balance, a delicate measuring instrument used in scientific research
- Torsion field (pseudoscience), a field alleged to make faster-than-light communication and paranormal phenomena possible, a theory by Russian scientists
- The field used in Einstein–Cartan theory and other alternatives to general relativity that involve torsion of spacetime
- In biology:
- Torsion (gastropod), a developmental feature of all gastropods
- In warfare:
- Torsion siege engine, a kind of catapult
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