OBOL
Obol
The obol was an ancient silver coin. In Classical Athens, there were six obols to the drachma ; it could be exchanged for eight chalkoi . Two obols made a diobol, weighing around 1.41-1.43 grams of silver. Triobols were also in use.The above text is a snippet from Wikipedia: Obol (coin)
and as such is available under the Creative Commons Attribution/Share-Alike License.