Blend of 2 triangular prisms

The blend of 2 triangular prisms, or tutrip, is a segmentohedron. It consists of 4 triangles and 4 squares. It is a cupolaic blend of two triangular prisms seen as digonal cupolae sharing a square face which blends out.

It is a segmentohedron as a stellated square (a degenerate compound of 2 perpendicular edges) atop pseudo square. It is notable for showing up as a cell in many scaliform polytopes, and is one of the simplest orbiform polyhedra that can be constructed only as a blend, rather than by removing vertices from a larger polyhedron.

It is isomorphic to the gyrobifastigium.

It has multiple analogues in higher dimensions, such as the blend of 3 square pyramidal prisms and blend of 3 triangular-square duoprisms in 4D.

Vertex coordinates
A tutrip of edge length 1 has vertex coordinates given by:
 * $$\left(±\frac12,\,0,\,\frac{\sqrt3}{3}\right)$$,
 * $$\left(0,\,±\frac12,\,\frac{\sqrt3}{3}\right)$$,
 * $$\left(±\frac12,\,±\frac12,\,-\frac{\sqrt3}{6}\right)$$.