Many fiction series incorporate reference to currencies. Frequently, particularly in fantasy novels, these are gold, silver, and copper coins.
“Galleons are gold coins used as currency in the wizarding world. One Galleon is worth 17 Sickles...Galleon
“Sickles are silver coins used as currency in the wizarding world. One Sickle is worth 29 Knuts...Sickle
“The largest unit of money in the wizards' world is a gold coin called a Galleon. One Galleon is...Wizards' money