Most people believe that after Ajna chakra, the next is Sahasrara. It is true, but Bindu comes first, before Sahasrara. Not actually a chakra, but an important point, so I will share its importance with you.
Bindu literally means ‘drop’ or ‘point’. Mostly indicated as Bindu Visraga, this literally means ‘falling of the drop’. Located at the top back of the head, where the Brahmins leave Shikha, a tuft of hair. Bindu is represented by the crescent moon and a white drop, which is the nectar flowing towards Vishuddhi chakra. This centre controls all metabolic processes, produces nutrition and the required oxygen quantity needed.
Bindu is also the centre of concentration for psychic sounds, Nada, which manifest at this point during practices like brahmari pranayama and shanmukhi mudra, both arising the awareness of Nada.
Symbolized by the full moon as the drop of nectar, and the crescent moon which is associated with the phases of the moon. Bindu has no specific practices for awakening. Once Vishuddhi becomes active it will have a consequential influence on bindu.
• Sure ways to self-realization, Swami Satyananda Saraswati
• Kundalini Tantra, Swami Satyananda Saraswati