What currencies can be used as the in-game currency of a game or application?

Question

Java

What currencies can be used as the in-game currency of a game or app?
For example, is it possible to use dollars, rubles, euros, crowns, and so on? Or is it possible to use "mythical" currencies - drachmas, aces, obols
, mites, libra, etc.
Or is it necessary to invent your own ...?)) there will be 10-15 pieces

Answer 1

credits, coins, gold, silver

Answer 2

In the absence of imagination, you can always use "credits"

Answer 3

Bitcoins

Answer 4

Well, for example, many games use dollars. And with the mythical - the main thing is that they are not patented.

Answer 5

Or is it possible to use "mythical" currencies - drachmas, asses, obols, mites, libra, etc.

Saturday... The last currency was read as "litres"... By the way - in some places it is really a universal currency.
You can use anything that is not patented. Including symbols.

Answer 6

lids)