This is a simpler “single angle” polyhedron, in which the faces meet at right angles except on a single edge, where they meet at 15°.
There is an annotated version [here](https://sketchfab.com/3d-models/single-angle-15-coloured-8230e145f97c4daba4cfbaf317f0a55b/properties) which gives more information about how it is constructed.