Cleavage is usually in three directions parallel to the rhombohedron form. A "trigonal trapezohedron" is an "isohedral rhombohedron". E-lum kite has the shape of rhombohedron. The cube is also a square parallelepiped, an equilateral cuboid and a right rhombohedron. The unit cell is a rhombohedron (which gives the name for the rhombohedral lattice). Amongst other allegorical symbols, the picture includes a magic square and a truncated rhombohedron. A tetrahedron is orthocentric if and only if its circumscribed parallelepiped is a rhombohedron. Since all edges must have the same length, every trigonal trapezohedron is also a rhombohedron.