Meaning of Vayu
Prana is subtler than air and can be defined as the energy essence that is within everything in the universe. Prana refers to the energy as basis of all life. In our body there are 84 types of vayu and prana traditionally divided into 10 forces but the main 5 forces known as panch prana are as follows - prana, apana, samana, udana and vyana. The other sub prana are - nag, kurma, kirkal, debadutta anddhananjaya.