Pentachoric hemiantiprism

The pentachoric hemiantiprism, or phap, is a uniform hemipolyteron. It has 2+10 regular pentachora and 5 central hexadecachora as facets, with 1+5 pentachora and 4 hexadecachora at each vertex. It is the 5D demicross.

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 1 and 5 spots.