The Johnson solids are a set of 3D polyhedra that are convex and have regular polygons as their faces. They are distinct from the Platonic solids and other uniform polyhedra. There are a total of 92 Johnson solids, named after Norman Johnson who enumerated them. Out of these, 5 solids are chiral, meaning they are distinct from their mirror images. The Johnson solids include pyramids, cupolae, and rotundae, as well as various combinations and modifications of these shapes. There are also augmentations of polygonal prisms and diminishings of regular and uniform polyhedra. The last few Johnson solids are unique and can’t be obtained through simple operations on other shapes. They are known as crown jewels due to their rarity and unique properties.
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