The French currency system is composed of several different denominations. The franc (5 letters) is the main unit of currency, and is divided into 100 centimes (7 letters). The euro (4 letters) is the official currency of the European Union, and is also used in France. The livre (5 letters) is an older form of currency, which was replaced by the franc in 1795. The sou (3 letters) is a smaller denomination of the franc, and is no longer in circulation. The louis (5 letters) is another former form of currency, which was replaced by the franc in 1795. In recent years, euros (5 letters) have become increasingly popular in France.