“Girih” is Persian for “knot,” and refers to the straight lines that run through these tiles, forming what’s called “strapwork.”Girih tiles are a set of five tiles that were used in the creation of tiling patterns for decoration of buildings in Islamic Architecture. The five shapes of the tiles are:a regular decagon with ten interior angles of 144°;an elongated (irregular convex) hexagon with interior angles of 72°, 144°, 144°, 72°, 144°, 144°;a bow-tie (non-convex hexagon) with interior angles of 72°, 72°, 216°, 72°, 72°, 216°;a rhombus with interior angles of 72°, 108°, 72°, 108°;a regular pentagon with five interior angles of 108°.