 In his "Light on Yoga", B. K. S. Iyengar uses a forearm support, with the fingers interlocked around the head, for the basic posture Śīrṣāsana I and its variations; he demonstrates a Western-style tripod headstand, the palms of the hands on the ground with raised elbows, for Śīrṣāsana II and III; and other supports for further variants.Iyengar names and illustrates ten variants in all, as well as several preparatory and transitional poses.The yoga headstand is nicknamed "king" of all the asanas.