Found, a correllation between Secret Sword Hand form for combat where Index and Middle fingers straight and Ring and Pinky and thumb forming circle ...And... Prana Mudra meditation hand form of also Index and Middle fingers straight and other finger's touching As defined to have the effect of pumping energy in the body! Note also as far as sounds in confunction such as "Ha" correllated to the middle finger of the Heart channell as a straight finger for the energy to flow out. Note, I think the differance of the other fingers touching fingertips as a bit different in the strike where circled is to protect those fingers from danger of injury as well as to circle the energy in their associated meridian to add to the outflow.