The caduceus, with two wings, is carried by Mercury ( aka Hermes) who, in addition to being the messenger of the gods, is also the patron god of thieves. It's commonly used as a symbol of medicine instead of the more correct staff of Aesculapius, a son of the god Apollo. That staff, with a single wing and a snake wrapped around it, is supposed to suggest wisdom. It is also reminiscent of a biblical story in the bible in which Moses cures snakebites by making a bronze staff with a snake coiled around it.
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The Caduceus vs Rod of Asclepius
