Leonardo Fibonacci was a thirteenth-century Italian mathematician who discovered the significance and unique properties of a simple number series, in which each numeral is added to the previous to create the next one in the series: 0,1,2,3,5,8,13, etc. Fibonacci numbers, and more significantly the ratio of those numbers to each other, can be found throughout nature and cycles. Fibonacci ratios are used in technical analysis to predict retracement areas during pullbacks, as well as targets, called “extensions,” for projected price moves.