When sft42 says "right before WW", that presumably refers to 1923, when the hyperinflation culminated in the exchange rate being 4,200,000,000,000 marks in one dollar. The 1923 hyperinflation in Germany is the most famous one, but there have been various others, including Greece and Hungary in 1946, and Serbia at the end of 1993. When I was a coin-collector as a child, I bought a one-million-billion pengo note from Hungary 1946. It cost 85p. (I am still not sure whether this means billion with 9 or 12 zeroes). And in Darth Vader's answer, a squillion is currently c. 2,300,000 (I remember when it was only a few hundred).