or chiefly Britishrouble/ˈruːbəl/
or chiefly British rouble /ˈruːbəl/
Learner's definition of RUBLE
1 [count] : the basic unit of money of Russia
It costs 40 rubles.
a hundred-ruble bill
2 [count] : a coin representing one ruble 3 the ruble technical : the value of the ruble compared with the value of the money of other countries