What is "nyorai"

The Japanese word is the translation of the Sanskrit and Pali word Tathagata, the term the historical Buddha used most often to refer to himself. Among his Japanese honorifics, it is the one expressing the highest degree of respect. Although originally applied only to Buddha himself, with the advent of Mahayana Buddhism Tathāgata (and therefore Nyorai) came to be used for all those who have achieved enlightenment, entities which occupy the highest of the four ranks of the Japanese Buddhist pantheon. Their rank is accordingly called the .