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Reference.org
Regular 4-polytope
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, a regular 4-polytope or regular polychoron is a <a href="/facts/Regular_polytope/RYTnEF6Q">regular</a> <a href="/facts/4-polytope/mY8vBpec">four-dimensional polytope</a>. They are the four-dimensional analogues of the <a href="/facts/Regular_polyhedron/HJ6oGyug">regular polyhedra</a> in three dimensions and the <a href="/facts/Regular_polygon/ws89Nhpt">regular polygons</a> in two dimensions. </p><p>There are six <a href="/facts/Convex_polytope/2pRHcRgC">convex</a> and ten <a href="/facts/Star_polytope/XyeJWj3d">star</a> regular 4-polytopes, giving a total of sixteen. </p>