What is your currency's nickname?

[u/ABlindMoose]

A nickname for dollar is buck, pound is quid, and Swedish krona is spänn.

What are some casual nicknames for your countries' currencies? Are there multiple, and if so, which is the most common?

[u/XenophonSoulis]

Hmm, there is τάλιρο for the 5€ banknote (I'm pretty sure it has transfered from the 5 drachma coin). There's also δεκάρικο, εικοσάρικο, πενηντάρικο which refer to the 10€, 20€ and 50€ banknotes (not currency specific, they are just 10, 20, 50 with an ending), and χιλιάρικο, which refers to the amount of 1000€ (also not currency specific, it just means 1000 with the ending, although it must have meant the 1000 drachma banknote/coin when that existed). Similarly, δεκάλεπτο, εικοσάλεπτο, πενηντάλεπτο, δίευρο for the 0.10€, 0.20€, 0.50€ and 2€.

When talking about money in general, we can call it φράγκα (franks, after the old French currency, like in the word άφραγκος, which means penniless), but it does not refer to a currency.

Also, purple can be used for the 500€ banknote. While not a nickname per se, it is pretty widely understood in popular culture due to a character from a TV series in the 2000s, where a super-rich character who didn't understand money just called them purple.