A Polyptych refers to a painting or carving that has four or more panels. Paintings of three panels are triptychs and of two, diptychs. In most works there is a larger central panel called the "main panel", and the other panels are called "side-panels" or "wings". In photography a polyptych can refer to a photograph with four portraits or sections.
Tony Hancock; Sid James; and crew of 'Hancock'
by Bob Collins
by Unknown photographer
Sir Peter Reginald Frederick Hall
by Tom Phillips