PLEASE NOTE:

When designing a logo please note the difference between the Caduceus and the Rod of Asclepius.

2 snakes on a stick = Caduceus. This is what most people are using. It is the symbol of Mercury/Hermes. God of tricksters and thieves, bankers and merchants.

1 snake on a stick =  Asclepius. This is a symbol of healing and medicine.

Please don't use them blindly and be aware of the meaning.

"The caduceus is often used incorrectly as a symbol of healthcare organisations and medical practice (especially in North America) due to confusion with the traditional medical symbol, the rod of Asclepius, which has only one snake and is never depicted with wings."