Mauritanian monetary unit is the currency used in Mauritania, which is officially called the ouguiya. There are several synonyms for this currency unit. The most common synonym is MRO, which is the ISO currency code for the ouguiya. Other synonyms include the Mauritanian franc, the Mauritanian dollar, and the Mauritanian euro, although these terms are not official. The ouguiya is divided into five khoums and is widely used for daily transactions in Mauritania. It is also linked to the currency of the Central Bank of West African States, the West African CFA franc.