MRO is also the acronym for the Mars Reconnaissance Orbiter

The Mauritanian ouguiya (ISO 4217: MRO) is the currency of Mauritania. The only circulating currency other than the Malagasy ariary whose division units are not based on a power of ten, each ouguiya is comprised of five khoums خمس. As of January 19, 2005, 1 Euro is worth 335.049 ouguiya, while 1 US dollar is worth 258.100 ouguiya

Coins in circulation

• 0.2 Khoum
• 1 Khoum
• 1 Ouguiya
• 5 Ouguiya
• 10 Ougiya
• 20 Ougiya

Banknotes in circulation

• 100 Ouguiya
• 200 Ouguiya
• 500 Ouguiya
• 1000 Ouguiya

New banknotes were introduced in 2004 to upgrade security features. They include all the same denominations but with a new 2000 Ouguiya banknote.