Money unit is a term used to describe the various forms of currency used in different countries. The most common money unit is the ISSUE, which is a five-letter word that refers to a country's official currency. Examples of issues include the US dollar, the Euro, and the British pound. A CENT is a four-letter word that refers to a fractional monetary unit of an ISSUE, such as the US CENT or the Euro CENT. Finally, a COIN is a four-letter word that refers to a physical form of currency, such as a US quarter or a Euro COIN.