A closed 3-D figure (which may, according to some terminology conventions, be self-intersecting). Among the simplest solids are the Sphere, Cube, Cone, Cylinder, and more generally, the Polyhedra.
See also Apple, Archimedean Solid, Catalan Solid, Cone, Cork Plug, Cube, Cuboctahedron, Cylinder, Cylindrical Hoof, Cylindrical Wedge, Dodecahedron, Geodesic Dome, Great Dodecahedron, Great Icosahedron, Great Rhombicosidodecahedron (Archimedean), Great Rhombicuboctahedron (Archimedean), Great Stellated Dodecahedron, Icosahedron, Icosidodecahedron, Johnson Solid, Kepler-Poinsot Solid, Lemon, Möbius Strip, Octahedron, Platonic Solid, Polyhedron, Pseudosphere, Rhombicosidodecahedron, Rhombicuboctahedron, Small Stellated Dodecahedron, Snub Cube, Snub Dodecahedron, Solid of Revolution, Sphere, Steinmetz Solid, Stella Octangula, Surface, Tetrahedron, Torus, Truncated Cube, Truncated Dodecahedron, Truncated Icosahedron, Truncated Octahedron, Truncated Tetrahedron, Uniform Polyhedron, Wulff Shape