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