What is the term for a system of money in general use in a particular country?

The term "currency" refers specifically to the system of money that is in general use within a particular country. It encompasses the physical bills and coins as well as the various forms of electronic money utilized for transactions in the economy. Currency serves as a medium of exchange, a unit of account, and a store of value, which are essential functions for facilitating trade and economic stability.

Capital generally refers to financial assets or resources used for investment and production, credit revolves around the ability to borrow money, and investments pertain to the allocation of money to generate profits or appreciation in value. Each of these terms relates to finance but does not specifically define the system of money used for everyday transactions like "currency" does.