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Amitayus is one of the longevity Buddhas, and this is clearly seen in the translation of his Sanskrit name: amita = infinity, and ayus = existence, life.
He is red in color, the color of sunset (which could symbolize the attainment of nirvana).
Hid hands are in his lap in meditation mudra holding a golden vase containing the nectar of Long Life, in which a wish-fulfilling tree grows.
Amitayus is a manifestation of Buddha Amitabha, one of heads of the Five Buddha Families.