A Roman dodecahedron or Gallo-Roman dodecahedron[1][2] is a small hollow object made of copper alloy which has been cast into a regular dodecahedral shape with twelve flat pentagonal faces. Each face has a circular hole of varying diameter in the middle, the holes connecting to the hollow center, and each corner has a protruding knob.[1] Roman dodecahedra date from the 2nd to 4th centuries AD and their purpose remains unknown.[1] They rarely show signs of wear, and do not have any inscribed numbers or letters.[3]