ὀβολός

Etymology
From. Plutarch tells us in Lysander 17 that, in early times, nails were used as money, six of which made a handful, and that the name was changed to.

Noun

 * 1) obol, obolus, used at Athens as both a weight and a coin, equaling one sixth of a drachma
 * 2) a Corcyrean coin