Silver hemiobol from Athens (Greece) showing on the obverse the head of Athena and the reverse an owl and the letters AOE. The hemiobol was often used in Greek mythology to pay the Ferryman to cross the River Styx.

Silver Tritartemorion (or 3/4 obol) from Athens, Greece. Obverse shows a head of Athena and the reverse the letters AOE surrounded by crescents.

Silver drachma from Athens (Greece) showing on the obverse the head of Athena and on the reverse an owl with the letters AOE.

Silver tetradrachm from Athens (Greece) showing on the obverse the head of Athena and on the reverse an owl with the letters AOE.

Silver tetradrachm from Athens (Greece) showing on the obverse the head of Athena and on the reverse an owl with the letters AOE.

Silver obol from Athens (Greece) showing on the obverse a four spoked wheel and on the reverse incuse of same.