The document discusses Platonic solids, which are 3D shapes with faces that are all regular polygons with the same number of faces meeting at each vertex. There are five Platonic solids: the cube, dodecahedron, icosahedron, octahedron, and tetrahedron. The document provides details on the number of faces and vertices of each solid. It also suggests extensions like sketching the dual shapes and exploring Archimedean solids with more than one type of regular face.