Ancient Greek coins were used as currency in the ancient world and are still collected today. Oboli (5 letters) were small silver coins used in Ancient Greece, while obols (5 letters) were copper coins. Euros (5 letters) were gold coins used in Ancient Greece, while Ionia (5 letters) was an ancient region in Anatolia where coins were minted. STOA (4 letters) was a type of building in Ancient Greece where coins were exchanged.