This guy has a huge and interesting article about them with a bunch of extra hi-res pictures directly from the 1987 discoverer mentioned in the mentalfloss arti

This guy has a huge and interesting article about them with a bunch of extra hi-res pictures directly from the 1987 discoverer mentioned in the mentalfloss article. https://www.celticnz.co.nz/Dodecahedron/Decoding%20the%20Druidic%20Dodecahedron1.html https://www.celticnz.co.nz/Dodecahedron/Decoding%20the%20Dru... His take is that they were used for conversion between regional dimension standards, like imperial:metric today.