|The caduceus: two snakes|
|The rod of Asclepius: one snake|
It's interesting how easily a mistake can become embedded into a culture. Many have noted that the statue of Eros in Piccaddilly is actually Anteros. That kind of mistake is easily forgiven - who on earth has heard of Anteros?
But Hermes has got nothing to do with medicine. His caduceus, or staff, has two snakes entwined around it; somehow it has become associated with the medical profession in America. It does not seem all that appropriate for a god who ushers the dead into the underworld to be the symbol of the profession. It all rests on a simple error of sight: the staff of the god Asclepius, the god of healing, has one serpent entwined around it - an ambiguous symbol, of course; but what a difference a snake makes.