A few good terms to know:
▪polyhedron: Derived from the Greek words ‘poly’ for many, and ‘hedron’ for faces. It refers to the many polygons that comprise these three-dimensional shapes.
▪polyhedra: Plural form of polyhedron.
▪net: A two-dimensional plan of the faces of a polyhedron that can fold up into that three-dimensional shape.
▪Net Book: My name for a book, like this one, which is a collection of nets.