Joined triangular duotegum

The joined triangular duotegum is a convex isochoric polychoron and member of the family of joined duotegums with 18 notches as cells.

Each cell of this polychoron has rectangular pyramidal symmetry, with 6 isosceles triangles for faces.

Isogonal derivatives
Substitution by vertices of these following elements will produce these convex isogonal polychora:
 * Notch (18): Rectified triangular duoprism
 * Isosceles triangle (18): Rectified triangular duoprism
 * Isosceles triangle (36): Semi-uniform hexagonal duoprism
 * Edge (6): Triangular duotegum
 * Edge (9): Triangular duoprism
 * Edge (36): Triangular duoexpandoprism
 * Vertex (6): Triangular duotegum
 * Vertex (9): Triangular duoprism