A lozenge (◊), also known as a iamond, 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 45°. The lozenge shape is often used in parquetry and as decoration on ceramics, silverware, and textiles.