triplex

This elucubration was called: "Triplici nodo triplex cuneus," which probably means "A triple pry for the triple knot."

A material known as triplex glass had been experimentally made.

My armour is the aes triplex of a clear conscience, and a mind nourished by the precepts of philosophy.

He is triceps "three-headed," triplex or tergeminus "threefold," triformis "of three bodies," or simply Tricerberus.