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A duoantitegum is an isotopic polytope constructed as the dual to a duoantiprism. It is generally named for the duals of the polytopes that form the dual duoantiprism.

in 4D, an mn- duoantitegum has 2*m*n cells, generally with digonal pyramidal symmetry (unless m = n where it has antiprism symmetry), constructed as a kind of expanded disphenoid, with 4 kites and 4 isosceles triangles for faces. If one of the base polygons is a digon, the pair of adjacent triangles at one end becomes coplanar, turning into a single rhombus.