Medial biomnisnub tetracontoctachoron

The medial biomnisnub tetracontoctachoron or mebosc is a convex isogonal polychoron that consists of 48 snub cubes, 144 square antiprisms, 192 triangular antiprisms, 288 tetragonal disphenoids, 1152 phyllic disphenoids of two kinds and 3456 irregular tetrahedra of three kinds. However, it cannot be made uniform.

The polychoron resembles the great biomnisnub tetracontoctachoron in every way except for the vertex figure's topology, in which the medial version's 5-valence vertex is not adjacent to the 6- and 8-valence vertices, unlike the great biomnisnub tetracontoctachoron.