Hands
symbol of strength, authority, and power, a mean- ing perhaps dating to the ancient Egyptians, whose term for the hand also related to pillar and palm. In Alchemy, the right hand signifies the masculine principle and ratinal, conscious thought, and the left hand signifies the feminine principle and intuitive, unconscious thought.
Thus clasped hands in alchemy symbolize the mystic marriage of opposites to create wholeness and also the communication between the conscious and unconscious. Wikipedia