The one hundred quintillion pengő banknote is one of the highest denomination banknotes ever circulated, issued in 1946 during Hungary's extreme post-WWII hyperinflation, a period of unprecedented economic chaos where the currency lost value incredibly fast. This massive note, sometimes called the one hundred million b.-pengő, was part of a series symbolizing the peak of this inflation, though an even higher, unissued sextillion pengő note was also printed.