Other Reuleaux polygons are used to drill pentagonal, hexagonal, and octagonal holes. It is the Goldberg polyhedron GP(1,1) or {5+,3}, containing pentagonal and hexagonal faces. It stands 60 metres high with a dodecahedron tank atop a pentagonal pillar. Edo Kibashi chopsticks, which are pentagonal hexagonal or octagonal, make them easy to hold. An icosahedron can also be called a gyroelongated pentagonal bipyramid. The 10 interior vertices have the convex hull of a pentagonal antiprism. It can be seen as a net of a pentagonal pyramid although with isosceles triangles. The dual of a pentagonal prism is a pentagonal bipyramid. In geometry, the pentagonal prism is a prism with a pentagonal base. It can be decomposed into two pentagonal pyramids and a pentagonal antiprism in the middle. The capsid consists of 12 pentagonal trumpet shaped pentamers. The symmetry group of a right pentagonal prism is "D" of order 20. The number turns up frequently in geometry, particularly in figures with pentagonal symmetry. An example is the sphinx tiling, an aperiodic tiling formed by a pentagonal rep-tile. Each player has a set of 20 flat wedge-shaped pentagonal pieces of slightly different sizes.