Small demiprismated icosiheptaheptacontadipeton

The small demiprismated icosiheptaheptacontadipeton or shopjak, also called the demiruncinated 221 polytope, is a convex uniform polypeton. It consists of 27 small prismated demipenteracts, 27 rectified triacontaditera, 72 small prismated hexatera, and 216 rectified pentachoric prisms. 2 small prismated demipenteracts, 1 rectified triacontaditeron, 4 small prismated hexatera, and 4 rectified pentachoric prisms join at each vertex. As the name suggests, it is the demiruncination of the icosiheptaheptacontadipeton.

The small demiprismated icosiheptaheptacontadipeton contains the vertices and edges of a prismatotruncated hexateric prism.