Greek lepton
The lepton, dual lepto, plural lepta (Greek: λεπτόν, λεπτώ, λεπτά), is the name of various fractional units of currency used in the Greek-speaking world from antiquity until today. The word means "small" or "thin", and during Classical and Hellenistic times a lepton was always a small value coin, usually the smallest available denomination of another currency.