Trigon Engineering Society, a co-educational engineering society founded at the University of Virginia

In gemology, the triangular etch pits seen on the natural surfaces of a diamond

Military Sciences Building of Texas A&M University

Trigun, an anime series.

A triangle

A neume of obscure interpretation used in the notation of manuscripts from the Abbey of St. Gall.

Triplicity, a group of three astrological signs belonging to the same element

Trigon (comics), a fictional character in the comics series Teen Titans, the father of the superhero Raven

Trigon (band), a fusion band from Germany

Trigon (jazz), a folk jazz band from Moldova

Trigon (game), a ball game played in ancient Rome

The former name of the Blue Cross Blue Shield insurance company for the state of Virginia

Trigons, a logic puzzle created by Dell Magazines.