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About Russian Ruble
The ruble or rouble is the official currency of Russia. Banknotes and coins are issued by the Central Bank of Russia, which is Russia's monetary authority independent of all other government bodies.
The ruble is the second-oldest currency in continuous use, after pound sterling, as well as the first decimal currency. The ruble was the currency of the Russian Empire and later the Soviet Union, where it was known as the Soviet ruble. Following the dissolution of the Soviet Union in 1991, the Soviet ruble was replaced in Russia with the Russian ruble at par in the following year. The Russian ruble continued to be used in 11 post-Soviet states, forming a "ruble zone" until 1993. In 1998, the ruble was redenominated shortly before the 1998 financial crisis, at a rate of 1000 RUR = 1 RUB.
The ruble is a free-floating currency and is subdivided into 100 kopecks which have fallen out of use due to inflation. In 2023, the digital ruble was introduced. The Russian ruble is also used as a de facto legal tender in Baikonur, Abkhazia and South Ossetia. WikipediaAbout Mauritanian ouguiya
The ouguiya, at one time spelled "ougiya", is the currency of Mauritania. Each ouguiya constitutes five khoums.
The current ouguiya was introduced in 2018, replacing the old ouguiya at a rate of 1 new ouguiya = 10 old ouguiya, which in turn replaced the CFA franc at a rate of 1 old ouguiya = 5 francs.
The name ouguiya is the Hassaniya Arabic pronunciation of uqiyyah أُوقِية, meaning " ounce". Wikipedia