The caduceus is a symbol used often to represent medical practice. It consists of a winged staff with two snakes wrapped around it.
In the seventh century, the caduceus came to be associated with a precursor of medicine, based on the Hermetic astrological principles of using the planets and stars to heal the sick. As a symbol for medicine, the caduceus is often used interchangeably with the Rod of Asclepius (single snake, no wings), although learned opinion prefers the Rod of Asclepius, reserving the caduceus for representing commerce.
In Kundalini Yoga, it is thought to be a symbolic representation of the "subtle" nerve channels "Ida", "Pingala" and "Shushumna" described in yogic kundalini physiology.