tetrahedron
A polyhedron composed of four triangular faces. If all four faces are equilateral triangles, the tetrahedron is regular. Also known as a triangular pyramid (geometry).
A compound of two regular tetrahedra is called a stellated octahedron.
Examples
* !asset #20875379
See also
* d4 (die)
External links
* George Hart: Virtual polyhedra compounds
* Wikipedia: Tetrahedron
* Wolfram MathWorld: Regular Tetrahedron