Two Pyramids symmetrically placed base-to-base, also called a Bipyramid. They are the Duals of the Archimedean Prisms.

**References**

Cundy, H. and Rollett, A. *Mathematical Models, 3rd ed.* Stradbroke, England: Tarquin Pub., p. 117, 1989.

© 1996-9

1999-05-24