Commutator - What does it mean?
commutator | |
an electrical switch, in a generator or motor, that periodically reverses the direction of an electric current
(mathematics) (of a group'') an element of the form ''ghg?1h?1'' where ''g'' and ''h'' are elements of the group; it is equal to the group's identity if and only if ''g'' and ''h commute
(mathematics) (of a ring'') an element of the form ''ab-ba'', where ''a'' and ''b'' are elements of the ring, it is identical to the ring's zero element if and only if ''a'' and ''b commute
(wikipedia commutator)