caduceus
winged two-snake staff
Today this word meansThe winged staff with two entwined snakes, often seen in medical logos.
This is Hermes's property. It stands for commerce, messengers, and negotiation — not medicine.
The emblem of medicine is the staff of Asclepius, with a single snake. That is the one the World Health Organization uses.
Worth noting
The confusion spread widely after the U.S. Army Medical Corps adopted the caduceus in the early 20th century. When you see a logo, just count the snakes.