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

nothing ventured, nothing gained

(idiomatic) Speak no ill-fated words; let no feeding cause you ailment; literally Diseases enter through the mouth, disasters come out of the mouth.

(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