Bindu is a Sanskrit word meaning "point" or "dot".
Philosophy
In metaphysics, Bindu is considered the point at which creation begins and may become unity. It is also described as "the sacred symbol of the cosmos in its unmanifested state". Bindu is the point around which the mandala is created, representing the universe. Bindu is often merged with and ova. In the Yoga Chudamani Upanishad Bindu is a duality, with a white Bindu representing shukla and a red Bindu representing maharaj. The white Bindu resides in the binduvisarga and is related to Shiva and the Moon, while the red Bindu resides in the muladharachakra and is related to Shakti and the Sun. In yoga, the union of these two parts results in the ascension of kundalini to the sahasrara.
Chakra
In Tantra, Bindu is a point at the back of the head where Brahmins grow their tuft of hair. This point is below the sahasrara chakra and above the ajna chakra, and is represented by a crescent moon with a white drop. It represents the manifestation of creations such as consciousness. The Bindu visarga is said to be the source of Bindu fluid, which contains a nectar and a poison. The fluid is released from the Bindu visarga, and can be stored in the lalana chakra and purified in the Vishuddha chakra. When the Vishuddha is inactive the fluid flows to the manipura chakra, where it is consumed. According to the Hatha Yoga Pradipika, a hatha yoga practitioner can prolong their life by controlling the flow of the fluid. Through practice of Khecari mudra, a practitioner can manipulate the flow of the fluid from the lalana to the Vishuddha. The picture of the chakra is a lotus with 23 petals. Its symbol is the moon, which supports the growth of vegetation. Krishna said in the Bhagavad Gita XV/13, "Becoming the nectarine moon I nourish all plants". Its divinity is Shiva, who is portrayed with the crescent moon in his hair. The Bindu chakra is a centre for health, giving us the power for physical and mental recuperation. It benefits eyesight, quietens the emotions and promotes inner harmony, clarity and balance. With the help of this chakra we are capable of controlling hunger and thirst, gaining the ability to overcome unhealthy eating habits. Concentration on Bindu relieves anxiety and depression, nervousness and feelings of oppression in the heart. In Tibetan Buddhism Bindu refers to the subtle body, which is composed of drops and winds.
Practices
Exercises for the Bindu Chakra are:
Agnisāra Kriyā
Ujjāyī Prānāyāma with Khecharī Mudrā and Jālandhara Bandha
Viparītkaranī Mudrā
Shirshāsana
Sarvāngāsana
Selected Āsanas activate the Bindu Chakra and balance physical functions
There are also special Meditations on the Bindu Chakra.