120-cell
In geometry, the 120-cell is the convex regular 4-polytope (four-dimensional analogue of a Platonic solid) with Schläfli symbol {5,3,3}. It is also called a C120, dodecaplex (short for “dodecahedral complex”), hyperdodecahedron, polydodecahedron, hecatonicosachoron, dodecacontachoron and hecatonicosahedroid.
Sources: http://www.gravitation3d.com/120cell/ http://www.polytope.de/ http://www.sub.uni-hamburg.de/opus/volltexte/2004/2196/pdf/Dissertation.pdf http://www.theory.org/geotopo/120-cell/ http://www.polytope.de/c120.html https://web.archive.org/web/20070204075028/members.aol.com/Polycell/glossary.html#hecatonicosachoron http://members.aol.com/Polycell/glossary.html#hecatonicosachoron https://www.youtube.com/watch?v=MFXRRW9goTs/ https://bendwavy.org/klitzing/dimensions/polychora.htm https://web.archive.org/web/20070204075028/members.aol.com/Polycell/section4.html