Some popular fretboard inlays include rhombuses, parallelograms, isosceles trapezoids, shark fins and rectangles. Under the inclusive definition, all parallelograms (including rhombuses, rectangles and squares) are trapezoids. The ornamental motifs consist in bands, rhombuses, squares, spirals and windings. Insignia for these functional titles existed, consisting of triangles, squares and rhombuses (so-called "diamonds"). The composition has sweeping rounded shapes beside heavily outlined rhombuses and other quadrilateral shapes. The fencing consists of extended rhombuses, which join at the corners. Each consists of six rhombuses with very unusual patterns carved in stone. Virtually their only superficial decoration, the , is based in a grid of rhombuses. The company logo is three rhombuses, each with two of its opposing corners curved.