Grand hecatonicosachoron

The grand hecatonicosachoron, or gahi, also commonly called the grand 120-cell, is one of the 10 regular Schläfli–Hess polychora. It has 120 dodecahedra as cells, joining 5 to an edge and 20 to a vertex in the form of a great icosahedron.

It is a faceting of the hexacosichoron, sharing its vertices and edges, and sharing the faces of the great hecatonicosachoron.