Ruble is the name of the official currency in Russia. (Today, in 2010, 30 rubles are roughly equal to 1 USD). The first rubles appeared in the 13th century. It's interesting to discover the origin of this word. The word "ruble' comes from the Russian verb 'rubitj' which means "to chop". In old times Russian used silver ingot bars as money. These ingot bars were chopped in 4 pieces, each ingot was called ruble.