Torsion

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