In geometry, a Johnson solid, sometimes also known as a Johnson–Zalgaller solid, is a convex polyhedron whose faces are regular polygons and that is not a uniform polyhedron. There are 92 such solids:48 composed of the primitive pyramids, cupolas, and rotundas assembled in various ways together with prisms and antiprisms; 35 formed by modifying uniform polyhedra, by augmenting, diminishing, or gyrating with primitives; and 9 which are not derived from "cut-and-paste" manipulations of uniform solids.