Spinopentachoric hemiantiprism

The spinopentachoric hemiantiprism, or nophap, is a uniform hemipolyteron. It has 20 regular pentachora and 5 central tesseractihemioctachora as facets, with 10 pentachora and 4 tesseractihemioctachora at each vertex.

It is a faceting of the triacontaditeron, with pentachoric antiprismatic symmetry. The pentachora of the triacontaditeron are arranged in a 1 5 10 10 5 1 arrangement, with the pentachora of the pentachoric hemiantiprism in the 10 spots.