The "pure and sacred" form of Kannon Bodhisattva, one of Japan's most beloved deities.
Kannon literally means "watchful listening," and is often translated as "the one who sees/hears all". This is indeed the task of the compassionate Kannon -- to witness/listen to the prayers and cries (sounds) of those in difficulty in the earthly realm, and to help them achieve enlightenment.
Sho comes the Sanskrit "Arya," meaning holy.