For Fibonacci levels we have a term and definition in Coal Power.

Commonly observed ratios between the size of a main trend and retracements. The main ratios are 38.2%, 50%, 61.8%, 100% and 161.8%. These ratios are derived from the number series named after the Italian mathematician: 1,1,2,3,5,8,13, 21... If the first term is divided by the one to the right of it, the result gets nearer and nearer to 0.618, a ratio that recurs in nature and art. Fibonacci levels are used in the weird and wonderful Elliott Wave Theory.
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