Tondo

A tondo (plural "tondi" or "tondos") is a Renaissance term for a circular work of art, either a painting or a sculpture. The word derives from the Italian rotondo, "round." The term is usually not used in English for small round paintings, but only those over about 60 cm (two feet) in diameter, thus excluding many round portrait miniatures - for sculpture the threshold is rather lower.

This is a part from a 1933 Riley rear brake. I was asked to photograph it for my partner.