The “aperture of Brahma,” the opening of sushumna nadi (the central energy channel) at the crown of the head. It is where the polarity of ida nadi and pingala nadi dissolves in the Consciousness of Oneness. Above brahmarandhra is sahasrara, where there is no polarity. Brahmarandhra is the ending point of sushumna nadi and corresponds to the fontanel in the physical body.