 These polytopes are part of a family 511 uniform 9-polytopes with BC9 symmetry.The "rectified 9-orthoplex" is the vertex figure for the demienneractic honeycomb.There are two Coxeter groups associated with the "rectified 9-orthoplex", one with the C9 or [4,37] Coxeter group, and a lower symmetry with two copies of 8-orthoplex facets, alternating, with the D9 or [36,1,1] Coxeter group.