A Johnson solid is a convex polyhedron each face of which is a regular polygon. ( Compare with the Kepler solids, the platonic solids and the archimedean solids as well as the prisms and antiprisms). Those polyhedra which are left after you remove the [platonic solids]?, the [archimedean solids]?, the prisms, and the antiprisms. There are 92 Johnson solids. There is no requirement that each face must be the same polygon. An example of a Johnson solid that is neither a platonic solid nor an archimedean solid is a square based pyramid; it has one square face and four triangular faces.
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