This is a truncated sphere die where no number is located on a face.
The new numbering has interesting properties:
- two numbers adjacent to two faces sum to 13
- three numbers in a rounder area sum to 19 or 20
- six numbers surrounding a group of 3 faces sum to 39
There are 4 big rounded areas, bigger than the size of a face, so i do not guarantee the die will not stop on one of them: just relaunch it if this case occurs.
See also the D12 Shell.