What is a three-piece artwork called?

A three-piece artwork is called a triptych. The word comes from the ancient Greek word triptykos, which means three layers. Triptychs emerged during early Christianity when artists decorated hinged altarpieces. When opened up, these furnishings featured three panels, providing the perfect format for artists to paint three scenes side by side. Find a wide variety of fine art on 1stDibs.