The three sister mudrās: Vajrolī, Amarolī, and Sahajolī. They form a group related to the conservation and sublimation of vital fluids.

Vajrolī is the masculine practice of retention. Amarolī is the practice of consuming the fluid. Sahajolī is the natural union without loss of fluid.

These practices belong to advanced tantric haṭha yoga and require direct instruction from a competent teacher. They are not for autonomous practice.