This multiple fibonacci allows you to calculate 2 fibonacci retracements at the same time, the one on the right uses the traditional method for an autofibonacci and the one on the left will use a higher point, so you can find areas of confluence where the price has a good possibility of reversing.
Fibonacci retracement levels—stemming from the Fibonacci sequence—are horizontal lines that indicate where support and resistance are likely to occur.
Each level is associated with a percentage. The percentage is how much of a prior move the price has retraced. The Fibonacci retracement levels are 23.6%, 38.2%, 61.8%, and 78.6%. While not officially a Fibonacci ratio, 50% is also used.
The indicator is useful because it can be drawn between any two significant price points, such as a high and a low. The indicator will then create the levels between those two points.
How to use it: Only the important fib levels are marked, to find areas of confluence just look for the places where the lines from the left side fibonacci match with the lines from the right side fibonacci retracement.