The Navajo Code Talkers believed that if you ever cut their hair, their ability to connect to the spirits would be severed. They got dispensation from the US Military to prevent the cutting of their hair.
Samson lost his strength when his hair was cut.
Many believe that the hair represents a sort of aura or antenna which assists in psychic or paranormal abilities.
In our Western culture, the hair is a manifestation of beauty – it is textural, sensual, and we groom it to ensure that we project the right image.