What is this item call?

People in the medical field wear pins with this item on it, and you can see it on some ambulances even. It has wing above two snakes intertwined? I always thought it be a helix, but I think I'm wrong. I stipulation a picture of it and can't find one. Pleeze help??What is this item call?
it's call a caduceus
go to google and look into in imagery.
http://images.google.com/images?um=1&tab...
caduceus it is...mine's tattooed on my left arm
A caduceus (/k'dusis/, -s, -'dju-; kerykeion within Greek; Unicode U+2624 () on the Miscellaneous Symbols table) is a winged staff beside two snakes wrapped around it. It was an ancient astrological symbol of commerce and is associated next to the Greek god Hermes, the messenger for the gods, conductor of the departed and protector of merchants and thieves. It be originally a herald's staff, sometimes with wing, with two white ribbons attached. The ribbons eventually evolved into snakes.