List of fictional currencies - Wikipedia

Fictional currency is the currency used in works of fiction. It may be used in alternative worlds, eras, or realities. The use of "credits" is particularly common in futuristic settings, so much so that Sam Humphries has pointed it out as a cliché: "In any science-fiction movie, anywhere in the galaxy, currency is referred to as 'credits.'" Credits are frequently envisioned as a form of electronic money.

Francis Tseng

Source: List of fictional currencies - Wikipedi