This indicator show the quasimodo patterns on the chart. Quasimodo pattern (QML) is the reversal pattern. This looks like head and shoulder pattern but this have two difference. On the quasimodo, second neck should be lower/higher (lower for the bearish, higher for the bullish) and quasimodo has no second shoulder. Usually QML line is an entry and head point is a stoplos.
Zigzag length is a length for the zigzag calculation.