The three-dimensional associahedron, an example of an enneahedron
In geometry, an enneahedron (or nonahedron) is a polyhedron with nine faces. There are 2606 types of convex enneahedron, each having a different pattern of vertex, edge, and face connections.[1] None of them are regular.
^Steven Dutch: How Many Polyhedra are There? Archived 2010-06-07 at the Wayback Machine
In geometry, an enneahedron (or nonahedron) is a polyhedron with nine faces. There are 2606 types of convex enneahedron, each having a different pattern...
triaugmented triangular prism, and a vertex for each face. It is an enneahedron (that is, a nine-sided polyhedron) that can be realized with three non-adjacent...
of a monoidal category. The three-dimensional associahedron K5 is an enneahedron with nine faces (three disjoint quadrilaterals and six pentagons) and...
properties, it can be represented in this way by a convex polyhedron, an enneahedron having polyhedron has nine quadrilaterals as its faces. This can be chosen...
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