Also known as hexateron, hexa-5-tope
In five-dimensional geometry, a 5-simplex is a self-dual regular 5-polytope. It has six vertices, 15 edges, 20 triangle faces, 15 tetrahedral cells, and 6 5-cell facets. It has a dihedral angle of cos−1(), or approximately 78.46°.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).