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.
encyclopaedie
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.
The pak sao is discribed as a slapping hand. It's one of the more widely used moves in ving tsun. This move is an excellent preparation for the...
The scissors gaan sao is to be considered equally as defensive or offensive move. It protects the whole upper body from waist to head.