A diptych (/ˈdɪptɪk/; from the Greek δίπτυχον, di "two" + ptychē "fold") is any object with two flat plates which form a pair, often attached by hinge.

What does a diptych represent?

The word diptych comes from the Greek root "dis," meaning "two," and "ptykhe," meaning "fold." Originally, the name was used to refer to folding writing tablets used in ancient Roman times. ... In later centuries, the diptych became a common way to display religious stories or to honor saints and other important figures.

What is a diptych and a triptych?

A diptych or triptych, originating from the Greek ptykhos meaning to bend, is an artwork made up of panels (either 2 or 3 respectively). While the panels may form a single scene, they sometimes are standalone pieces which are linked through a visual coherence. In the Middle Ages, the triptych was used to tell stories.