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Staff carried by Hermes as a symbol of peace. It served as a badge of protection for ancient Greek and Roman heralds and ambassadors. It was originally depicted as a rod or olive branch ending in two shoots and decorated with garlands or ribbons; in later iconography the garlands became two snakes and a pair of wings was attached to the staff to represent Hermes' speed. The caduceus was adopted as a symbol of physicians because of its similarity to the staff of Asclepius.
This entry comes from Encyclopædia Britannica Concise. For the full entry on caduceus, visit Britannica.com.