The term "rouble" refers to a unit of currency used in Russia and other countries that were once part of the Soviet Union. It is also known as the Russian ruble, and its symbol is ��� or RUB. The rouble was first introduced in 1704 by Peter the Great, who wanted to replace the Swedish coins that were then circulating in Russia with a new currency. Since then, it has been used as the official currency of Russia for several centuries and continues to be so today.