Triangular duoantitegum

The triangular duoantitegum, also known as the triangular-triangular duoantitegum, the 3 duoantitegum or the 3-3 duoantitegum, is a convex isochoric polychoron with 18 elongated tetragonal disphenoids as cells. Together with its dual, it is the first in an infinite family of triangular antiprismatic swirlchora.