The Point / Vital Essence (Bindu)

Bindu means 'point' or 'drop,' and it carries two linked senses. In haṭha-yoga it is the vital essence the yogin strives to conserve rather than spend, since its preservation is held to sustain vitality and life itself — many of the seals and locks aim at exactly this. In tantric metaphysics it is the concentrated 'point' of energy from which the universe expands, the dimensionless seed of manifestation, paired with nāda (sound) in accounts of how the one becomes the many.