Enneahedron

An enneahedron, also called a nonahedron, is a nine-faced polyhedron. The term "enneahedron" is generally preferred over "nonahedron" since while the former combines the Greek words for "nine" (ennea-) and "angle" (-hedron), the latter combines the Latin prefix nona with a Greek suffix.

There are 2606 distinct convex enneahedra, corresponding to the 2606 nonisomorphic nonahedral graphs.

Examples include those illustrated above and summarized in the following table.

			name
9	15	8	elongated triangular dipyramid ()
9	16	9	elongated square pyramid ()
9	16	9	Goddard-Henning enneahedron
9	16	9	octagonal pyramid
9	18	11	Herschel enneahedron
9	21	14	heptagonal prism