In Persia, the danake was originally a unit of weight for bulk silver, representing one-eighth of a shekel (1.05 gm).[5] This use of the word became obsolete. In the Hellenistic period and later it designated the silver Attic obol, which originally represented the sixth part of a drachma; in New Persian dâng means "one sixth".[3]
http://en.wikipedia.org/wiki/Danake