Han Dynasty 18-sided die
This dice is actually for a drinking game. has the top and bottome sides inlaid with the characters "驕" (arrogant) and "來 酒" ("bring up wine").
A similar 18-sided die was found in a Han mausoleum at Mawangdui with the characters "驕" (arrogant) and "畏 妻" ("fear of his wife") on the top and bottom.