The jut sao is executed with the inner part of the wrist and serves as a preparation for further attacks like a punch or a fung hao.
encyclopaedie
Biu sao is a forwardly oriented movement, regularly used under the other arm as an emergency attack. It points towards the target one wants to...
Wu sao will be described as protecting hand. It is the last line of defense in front of the body, before the attack reaches it.
The gaan sao is a hand move that reminds of a plough. It moves downwards following the orientation line.