# D4.9.0 (EntityTopic, 15)

### From Hi.gher. Space

**D4.9.0** is a bilbirothawroid constructed from the rectified 600-cell (o5o3x3o), first described by student91 on February 22, 2014.

## Construction

The rectified 600-cell has two embedded truncated dodecahedra that lie on parallel hyperplanes; the vertices that lie between these two parallel hyperplanes can be deleted, and the remaining two halves of the polytope glued together at the truncated dodecahedral sections, thus producing D4.9.0.

D4.9.0 can then be further diminished to produce CRF polytopes containing pentagonal orthobicupola or bilunabirotunda cells, such as D4.9.1 and D4.9.2.