Leonardo Fibonacci was a mathematician known for creating the Fibonacci sequence (also known as the Fibonacci series).
This Fibonacci sequence is an infinite succession of natural numbers determined by the sum of the previous two.
Thus, the Fibonacci sequence is 1, 1, 2, 2, 3, 5, 8, 13, 21, 34…
The Fibonacci sequence is used in technical analysis to try to predict the movements of a stock.