re·verse

1.
opposite or contrary in position, direction, order, or character: an impression reverse to what was intended; in reverse sequence.
2.
with the back or rear part toward the observer: the reverse side of a fabric.
3.
pertaining to or producing movement in a mechanism opposite to that made under ordinary running conditions: a reverse gear; a reverse turbine.
4.
acting in a manner opposite or contrary to that which is usual, as an appliance or apparatus.
5.
noting or pertaining to an image like that seen in a mirror; backward; reversed.

Norms are informally agreed-on standards that regulate team behavior.