From parallel waves: Centers or Ends (as designated) do a Scoot Back while the others U-turn back. When ends only do the Scoot Back, the ends facing out circulate to the other end of their wave and the ends facing in do the Turn Thru (or Left Turn Thru) on the diagonal with each other before moving to the opposite end of their wave. Then all Wheel and Deal. Finishes in eight chain thru formation.
Richard Silver 1972
This definition is from The Handbook of Modern Square Dancing by Jay King.
It is provided here for informational and educational purposes only.