The eleven Rudras are expansions of Shiva representing different aspects of destruction and cosmic functions. They include Kapali, Pinaki, Mrgavyadha, Tryambaka, Ajaikapat, Ahirbudhnya, Virupaksha, Sahasraksha, Nilagriva, Shambhu, and Shiva.
Eleven different forms with various attributes. The Rudram chant is divided into eleven sections honoring them.