A permutation.
Permission
A combination of outcomes (not a permutation) that a gambler bets on in the football pools.
To give hair a perm, using heat, chemicals etc.
An ordering of a finite set of distinct elements.
A transformation of a set's prime form, by applying one or more of certain operations, specifically, transposition, inversion, and retrograde.
One of the ways something exists, or the ways a set of objects can be ordered.
A one-to-one mapping from a finite set to itself.