The word torsion may refer to the following:
- 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
- In algebra:
- Torsion (algebra)
- Tor functor
- In medicine:
- Ovarian torsion
- Testicular torsion
- Any Organ torsion refers to twisting that interrupts the blood supply to that organ ie., splenic torsion
- Spiral fracture, a.k.a. Torsion fracture
- Bloat particularly in cattle and dogs
- Horse colic#Torsion
- In physics and engineering:
- Torsion (mechanics)
- Torsion coefficient
- Torsion pendulum
- Torsion spring or -bar
- Torsion field (pseudoscience), a theory by Russian scientists
- In biology:
- Torsion (gastropod), a developmental feature of all gastropods
- In warfare:
- Torsion siege engine, a kind of catapult
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