harmonic scannerbreakoutichartopstra options analytics appstock options calculatorthe logic calculatorstock charts technical analysisoptions calculatorstock options profit calculatorstock screener proCommonly observed market retracement levels of 38.2%(38%), 50% and 61.8%(62%) are derived from ratios of this logical number series. Traders apply Fibonacci levels to their charts between the start and end points of a notable trend and then examine the price patterns. In a nutshell, they look for bounces and reversals when a “Fib number” gets hit during a pullback.