Permutation

[Sarah]

Barter; exchange. Permutation lock, a lock in which the partscan be transposed or shifted, so as to require different arrangementsof the tumblers on different occasions of unlocking.

[Dianne]

any of the various ways in which a set of things can be ordered:

[Tariq Zaki]

A way, especially one of several possible variations, in which a set or number of things can be ordered or arranged.