This is an example of a caduceus. This one appears as the insignia of the EMS

SEVENTH.SEAL.THE JEFF.IN 63-0324E 541-2 {117} I was talking to a--one of the finest doctors there is in the southern states, in his office not long ago, a very fine specialist in Louisville, a real gallant man. And I said to him; I said, "Doctor, I want to ask you a question." He said, "All right." I said, "I noticed your medical sign, the staff, you got a serpent wrapped around a pole. What does that stand for?" He said, "I don't know." And I said, "It stands for this: It was a symbol of Divine healing where Moses lifted up the brass serpent in the wilderness (See?), which was only a symbol, only a symbol of the true Christ." Now, today, medicine is a symbol of Divine healing. And though many of them don't believe it (real good doctors do believe it), but some of them don't believe it, but their very emblem that they hold up testifies to the power of Almighty God whether they want to believe it or not. That's right. There's a brass serpent hanging on a pole on the medical emblem.