Fibonacci Retracement lines are channel lines formed using integers in the "infinite sequence," that is, the first two terms are added, and all subsequent terms are the sum of the preceding two terms, i.e., 1, 2, 3, 5, 8, 13... Fibonacci Retracement lines are based on the work of Leonardo Fibonacci, a thirteenth century Italian mathematician, and are available in the program. To display Fibonacci Retracements, you must be in Fibonacci Retracements