The currency used in Mauritania is the Mauritanian Ouguiya, which has been in circulation since Nov 30, 2017. Prior to this, the Mauritanian Ouguiya was used. The Mauritanian Ouguiya is represented by the symbol UM. The ouguiya, at one time spelled "ougiya", is the currency of Mauritania.
Mauritania Knowledge Knockout: 24 Questions to Determine Your Mastery