The Russian currency is the ruble, according to the XE website. The symbol for the ruble is ???. The ruble's minor unit is the kopek (?.), which amounts to 1/100 rubles.
The ruble has been used in Russia for around half a millennium. Other countries have used the ruble at various points in history. The ruble became the official currency of Russia in the 16th century, remaining the official currency until 1921. A dramatic decrease in value led to the redenomination of the ruble and the birth of the second ruble, which lasted only a year. The remainder of the 20th century saw third, fourth, fifth and sixth incarnations of the ruble before the final redenomination was issued in 1998.