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## Decayotton

The decayotton is the 9-dimensional simplex. It is also known as the pyroyotton under the elemental naming scheme.

## Enneract

Enneract is the 9-hypercube. Since the number of dimensions is a square number, the diagonal of a unit enneract is an integer - in this case, 3.

## 9-orthoplex

9-orthoplex (Ennears) is the 9 dimensional cross polytope.

## Enneaphere

An enneaphere is the 9-dimensional hypersphere.