Yoni mudrā — seal of the source. Yoni is the womb, the origin, the cosmic receptacle. It is a practice of contracting and elevating energy from the base.

“Of great secrecy” like Khecarī. These techniques were not transmitted publicly; they required preparation and spiritual maturity.

Yoni mudrā works directly with the base energy, awakening it and directing it upward. It is a fundamental practice in tantric haṭha yoga.