Octahedron
An octahedron has 8 triangular faces, 12 edges and 6 vertices.
This image of an octahedron was created by
Tom Gettys
using the program
Persistence of Vision.
See also
Transparent Octahedron,
Tetrahedron,
Hexahedron,
Dodecahedron,
Icosahedron,
Platonic Solid