QuoteThe above Ti-BASIC (https://en.wikipedia.org/wiki/TI-BASIC) program for the Ti-84 series is to calculate the Fibonacci Sequence. It is one of the ways to reach the Golden Ratio (https://www.wolframalpha.com/input?i=golden+ratio) (Phi): 1.618. Charters will know of the Fib Retracement indicator that makes use of this sequence.