The caduceus ☤ (pronounced /kəˈdjuːsiəs, -ʃəs/ kə-DEW-see-əs, from Greek kerykeion κηρύκειον) is a herald's staff, a symbolic object representing Hermes (or the Roman Mercury), and by extension trades, occupations or undertakings associated with the god. It is today typically depicted as a short staff entwined by two serpents in the form of a double helix, and is sometimes surmounted by wings. This staff was was also borne by Iris, the messenger of Hera.
In later Antiquity the caduceus provided the basis for the astrological symbol representing the planet Mercury and in Roman iconography was often depicted being carried in the left hand of Mercury, the messenger of the gods, guide of the dead and protector of merchants, shepherds, gamblers, liars and thieves.[1]
In addition to representing the planet Mercury, the caduceus is also a long-established historical symbol of commerce.[3] As one specialized study of symbolism notes, "In modern times the caduceus figures as a symbol of commerce, since Mercury is the god of commerce."[4] This association is ancient, and consistent from the Classical period to modern times.[5]