In mathematics, the term torsion usually has one of two unrelated meanings. The first is geometrical, measuring curvature of some sort:
Torsion of curves
Torsion tensor in differential geometry
Analytic torsion (also called Ray-Singer torsion)
Reidemeister torsion (also called R-torsion, Franz torsion, de Rham torsion)
Whitehead torsion
The second is algebraic, relating to the set of elements that vanish (e.g., elements of finite order).
Torsion
Tor functor
In medicine torsion can refer to
Testicular torsion
Bloat
In physics and engineering
Torsion
Torsion coefficient
Torsion pendulum
Torsion spring or -bar
Torsion field
Torsion a developmental feature of all gastropods
In semiotics
Semiotic torsion (James H. Bunn)
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