The Caduceus [medical snake symbol] is one of the most ancient of Symbols. You might best know this symbol as the DNA structure and healing used by the medical profession. Since ancient Mesopotamia the caduceus presented two serpents intertwined (the central nervous system) around a staff (the spinal column) with the wings (the "swan") on either side (the two hemispheres of the brain, with the circle in the center representing the pineal gland, or the central sun and psychic