Rod of Asclepius
The caduceus is the traditional symbol of Hermes and features two snakes winding around an often winged staff. It is often used as a symbol of medicine, especially in the United States, but this is incorrect. (The correct symbol for medicine is the Rod of Asclepius, which has only one snake and no wings.) The two-snake caduceus design has ancient and consistent associations with trade, liars, thieves, eloquence, negotiation, alchemy, and wisdom.