The U.S. dollar is the currency most used in international transactions. Several countries use the U.S. dollar as their official currency, and many others allow it to be used in a de facto capacity. It's known locally as a buck or greenback.
The pound, also known as the Lira, used to be the official currency of Cyprus but it has now been replaced by the Euro. However, the self-proclaimed Turkish Republic of Northern Cyprus officially uses the Turkish New Lira (TRY).