From parallel waves: Centers Crossrun, then Circulate. Ends Cross Circulate and then Trade. Right hand waves finish as left hand waves and vice versa. Can also be done from lines facing in or out and finishes with lines facing the same way as at the start. If done from two faced lines, it finishes with two faced lines.
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.