According to Baidu, there is a three-headed snake named Naga in Indian myths and legends. This is a kind of god beast similar to cobra. It has a long body and usually lives in water. Solemnly declare: the answer is for reference only, please don't be blindly superstitious.

Naga, the underground snake god in Indian mythology, is generally described as a humanoid creature with an upper body and a snake-shaped trunk and tail.