A
lozenge (
◊), often referred to as a
diamond, is a form of
rhombus. The definition of lozenge is not strictly fixed, and it is sometimes used simply as a synonym (from the
French losange) for rhombus. Most often, though, lozenge refers to a thin rhombus—a rhombus with acute angles of less than 45°. The lozenge shape is often used in
parquetry and as
decoration on
ceramics,
silverware and
textiles. It also features in
heraldry and
playing cards.