Torsion

The word means twisted.
In biology, usually refers to the spiral shape of Gastropod body and shells, seen easily in the garden snail. 
In mathematics, the term torsion has several meanings, mostly unrelated to each other.
 Torsion of curves
 Torsion of connection
 Torsion tensor
 Torsion (abstract algebra)
 Torsion (modules)
 Torsion (topology)
 In medicine torsion can refer to
 Testicular torsion
 Bloat
 Torsion (mechanics)
 Torsion coefficient
 Torsion pendulum
 Torsion spring or -bar