[Perhaps alteration (influenced by pool) of obsolete cesperalle, drainpipe, from Middle English suspiral, vent, from Old French sospirail, breathing hole, from souspirer, to breathe, from Latin suspÄ«rÄre, to sigh; see suspire.]
The Russian Ruble is also known as the Russian Rouble. The United States Dollar is also known as the American Dollar, and the US Dollar. The symbol for RUB can be written R. The symbol for USD can be written $. The Russian Ruble is divided into 100 kopecks. The United States Dollar is divided into 100 cents.
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.