From parallel Three and One Lines (end facing opposite to the other three): Ends Circulate as the center person of the three dancers facing the same direction does a U-turn back. Finishes in parallel waves.
From Three and One Lines (with one of the centers facing opposite to the other three): Finishes in parallel lines.
Lonnie Sturges 1976
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.