
A polyhedron (one polyhedron, many polyhedra, or polyhedrons) is a geometrical shape. It has flat faces, and straight edges. Usually it is defined by the number of faces, or edges.
Mathematicians do not agree on what makes a polyhedron.
Naming
Usually, polyhedra are named by the number of faces they have. The first polyhedra are the tetrahedron, which is made of four triangles, pentahedron (five faces, can look like a foursided pyramid), hexahedron (six faces, a cube if it is regular), and heptahedron (seven faces, can look like a prism based on a pentagon, or a pyramid based on a hexagon amongst others).
Images for kids

A skeletal polyhedron (specifically, a rhombicuboctahedron) drawn by Leonardo da Vinci to illustrate a book by Luca Pacioli
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Polyhedron Facts for Kids. Kiddle Encyclopedia.