Triangular duoantifastegium

The triangular duoantifastegium or triddaf, also known as the digonal-triangular duoantifastegiaprism, digonal-triangular duoantiwedge, is a convex scaliform polyteron and the first member of the duoantifastegium family. It consists of 4 triangular antifastegiums and 6 square scalenes, with 3 of each joining at each vertex.

It can be obtained as a diminishing of the demipenteract, by removing the vertices of 2 opposite edges.

Vertex coordinates
Coordinates for the vertices of a triangular duoantifastegium of edge length 1, centered at the origin, are given by:
 * $$\left(0,\,\frac{\sqrt3}{3},\,0,\,±\frac12,\,\frac{\sqrt6}{12}\right),$$
 * $$\left(±\frac12,\,-\frac{\sqrt3}{6},\,0,\,±\frac12,\,\frac{\sqrt6}{12}\right),$$
 * $$\left(0,\,-\frac{\sqrt3}{3},\,±\frac12,\,0,\,-\frac{\sqrt6}{12}\right),$$
 * $$\left(±\frac12,\,\frac{\sqrt3}{6},\,±\frac12,\,0,\,-\frac{\sqrt6}{12}\right).$$