Some common medical symbols are the caduceus, according to Dictionary.com, and the Bowl of Hygieia, says the University of Arizona College of Pharmacy. Another medical symbol is the Rod of Asclepius, says Livescience.
Both the caduceus and the Rod of Asclepius employ the symbolism of snakes, according to Livescience. They differ in that the caduceus is two snakes twined around the staff of Hermes. The staff is also winged, which hints at Hermes' role as messenger to the Olympian gods. The Rod of Asclepius is a wingless staff with only one snake twined around it.
The Bowl of Hygeia is a symbol of pharmacy, according to the University of Arizona College of Pharmacy. Hygeia was the assistant to Asclepius, and her symbol is basically a mortar and pestle.