(thing) by m_turner Tue Sep 12 2000 at 22:33:33
A tile for the game of dominoes - often called a bone. The tiles are most often made of wood, plastic, or ivory. Each tile is divided into two segments, each showing some number. 

+-----+-----+
| o o | o   |
| o o |   o |
+-----+-----+

I like it!