In which field is this symbol used?

Player #23514521, this and Herme's caduceus are both associated with healing. Both were probably inspirations for the modern symbol.

Also a symbol for the cancer institute in my country. Very beautiful

Player #23514521, i thought so

Moses made a copper snake and anyone who had been bitten by a snake would be healed when looking at it

Player #23514521, very humble 👍

It features prominently on the WHO flag

It Showed a Snake Symbol so I chose Herpetology 🤷‍♂️🤦‍♂️