(linguistics, uncommon) trigrade conjugation / (informal) 3-step process

a Romanization method of Japanese, combining the 標準式 (hyōjun-shiki) and 日本式 (Nihon-shiki) styles, that was adopted in 1937 by Cabinet order and slightly modified in 1954

(Buddhism) the supreme perfect enlightenment

(uranography) Winter Triangle - a bright asterism of the northern winter sky. Its corners are the stars Betelgeuse, Procyon, and Sirius.

(uranography) Summer Triangle - a bright asterism of the northern summer sky. Its corners are the stars Altair, Deneb, and Vega.

Kyūjitai form of 三位一体 (“Trinity”)

three-legged race / (idiomatic) cooperating and working together to accomplish a task

dirt cheap

(religion, Buddhism) Trailokyavijaya, the Wisdom King of the east, primarily revered in Vajrayana Buddhism

(Christianity) the Trinity