<human>:  With regards to the Fibonacci retracement, why is it called the Fibonacci retracement?
<bot>: Fibonacci was an Italian mathematician who discovered this retracement. In finance, a retracement is the portion of a price movement that occurs between two price extremes. A retracement is calculated by taking the difference between two consecutive highs and lows. The retracement is then divided by the distance between the two extremes.