Icosahedron
This is a pattern for making a paper icosahedron. An icosahedron is a solid shape with twenty faces. Each face is an equilateral triangle.
The instructions on the worksheet give the simplest method of constructing the icosahedron. With more care, a better looking icosahedron can be constructed.
A greater selection of polyhedron patterns can be made from Stella: The Polyhedron Navigator.