The caduceus, the staff of the Greek messenger god Hermes, has been wrongly used as a medical symbol for a little over one hundred years. It has often been mistaken for the Rod of Asclepius, a visually similar symbol belonging to the god of healing and medicine.
Both symbols feature snakes winding up the length of a central staff, though one has two snakes, and usually a set of wings, while the other has only one snake. Could you tell them apart?