What is demihepteract?

A demihepteract is a 7-dimensional geometric shape, also known as a 7-cube or a heptacube. It is made up of 192 vertices, 1680 edges, 6720 square faces, 13440 cubic cells, 17920 tesseract 4-faces, 13440 5-cell penteract 5-faces, 5600 6-simplex hexeract 6-faces, and 960 hepteract 7-faces. Its Schläfli symbol is {3,3,3,3,3,4}. The demihepteract is a regular and convex polytope and is one of 28 different regular and convex non-prismatic polytopes in 7-dimensions. It is a higher dimensional analog of a cube, consisting of 7 cubes joined together along their respective faces.