Above top to bottom are an Argentine 500,000 austral bill of 1990; a 1923 one billion German mark note (1 German billion = 1 U.S. trillion); and a Hungarian 100 Million B-pengö of 1946, with the “B” denoting the Hungarian billion, or a million million: this 100,000,000,000,000,000,000 pengö note is the highest denomination of currency ever issued by any country.