Photo caption: "Two dodecahedra and an icosahedron on display in the Rheinisches Landesmuseum Bonn, Germany."
A Roman dodecahedron or Gallo-Roman dodecahedron is a small hollow object made of copper alloy which has been cast into a regular dodecahedral shape: twelve flat pentagonal faces, each face having a circular hole of varying diameter in the middle, the holes connecting to the hollow center. Roman dodecahedra date from the 2nd to 4th centuries AD and their purpose remains unknown. They rarely show signs of wear, and do not have any inscribed numbers or letters.
The ancient roman equivalent of desk decoration. Something you think looks nice, so you bring it to the office and set it on your desktop.
That or as someone else said you can do some s*x with it.