ob·ol 
(ŏbəl) also ob·o·lus (ŏbə-ləs)
(ŏbəl) also ob·o·lus (ŏbə-ləs)n. pl. ob·ols also ob·o·li (-ə-lī′)
A silver coin or unit of weight equal to one sixth of a drachma, formerly used in ancient Greece.
[Latin obolus, from Greek obolos, variant of obelos, spit, skewer, obol (since the early Greek obol had the form of a long, slender rod like a spit for roasting).]