Order automorphism

An order automorphism (sometimes called a permutation) is a way of changing a set of numbers so that the order of the numbers is different. To put it more simply, it's a way of rearranging numbers. For example, if you had the numbers 1, 2, 3, 4, an order automorphism would rearrange them to 4, 1, 3, 2 so that the order is different.