Those key ratios are derived from the division of one Fibonacci number by another Fibonacci figure one, two or three places further in the sequence: 0 divided by 1, or 0; 1 divided by 1, or 1; 1 ...

Fibonacci retracement levels, derived from the Fibonacci sequence, are used to identify potential support and resistance levels. Key percentages include 23.6%, 38.2%, 50%, 61.8%, and 78.6%.