Medical insignia or symbol the Caduceus, the magic wand of the Greek god Hermes (Mercury), the god of commerce, eloquence, invention, travel and theft, and so was a symbol of heralds and commerce, not medicine. Even so this symbol has been adopted by many in the field of medicine. A short rod entwined by two snakes and topped by a pair of wings

Source: Silver Medical Caduceus Backpack | Zazzle