(Buddhism) the supreme perfect enlightenment

(figuratively) being carefree and unaware of an imminent danger

(figuratively) larger-than-life characters do not associate with unnoteworthy characters, nor do they concern themselves with trivial matters / (literally) boat-swallowing fish do not swim in tributaries

(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