Extensive study of Palmistry includes Chirognomy and chiromancy. Chirognomy deals with study of shape colour and texture of the hand, falanges,and mounts in the palm.
The cross between the head line and the heart line at the palm center is called inspiration line or mystic cross or sixth sense line.
Useful or practical hand looks square across the wrist, across the base of the fingers and the very ends of the fingers and nails appear square in shape.