Roman dodecahedron
The function or use of the dodecahedra remains a mystery; no mention of them has been found in texts or pictures of the time. Speculated uses include candlestick holders (wax was found inside one example); dice; survey instruments; devices for determining the optimal  sowing date for winter grain; that they were used to calibrate water pipes; and army standard bases. It has also been suggested that they may have been religious artifacts of some kind. This speculation is based on the fact that most of the examples have been found in Gallo-Roman sites.