Enneagonal duotegum

The enneagonal duotegum, also known as the enneagonal-enneagonal duotegum, the 9 duotegum, or the 9-9 duotegum, is a noble duotegum that consists of 81 tetragonal disphenoids and 18 vertices, with 18 cells joining at each vertex. It is also the 18-8 step prism. It is the first in an infinite family of isogonal enneagonal hosohedral swirlchora and also the first in an infinite family of isochoric enneagonal dihedral swirlchora.