[2] Heraklides of Pontus (died c. 310 BC) is cited as having mentioned the obols of Heraion and also gives the etymology of obolos (the name of the coin) from obelos (the word for "spit, spike, nail").Similarly, the historian Ephorus in his equally lost work On Inventions (mid 4th century BC) is said to have mentioned the obols of Heraion.[10] Diobols and triobols were differentiated from standard obols through slight variations to the owl design, changing the way the bird faced and how its wings were positioned for easily identifiable currency.Legend had it that those without enough wealth or whose friends refused to follow proper burial rites were forced to wander the banks of the river for one hundred years until they were allowed to cross it.[17] The obolus, along with the mirror, was a symbol of new schismatic heretics in the short stories "The Zahir" [18] and "The Theologians" by Argentine author Jorge Luis Borges.