What we describe as jum sao is the sinking elbow. This minimal move protects the under part of the upper body like belly and liver.
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.