It is called a triptych. They were common in middle ages religious art. Two panels is called a diptych.
There is no synonym for diptych. However, if the work of art were to have three panels, it would be known as a "triptych," a "tetraptych" if there are four, and so on.
Triptych (pronounced triptik)- like diptych for a set of 2.
A polyptych allowed for different arrangements
A polyptych allowed for different arrangements
tetraptych
A triptych. Split into two is a diptych. The name applies where a single image extends across all panels, or separate images on each panel.
It is spelt correctly in the question - diptych.
Melun Diptych was created in 1450.
Marilyn Diptych was created in 1962.
You can look for a triptych in a museum of art.
The Werl Triptych was created in 1438.