Coppock is an indicator for MT4 and MT5 by EarnForex.com. It is an implementation of the classic curve indicator by Edward Coppock who developed the formula it back in 1962.
It is plotted in a separate window of the chart using a histogram.
You can modify the indicator's period and style parameters.
It can be used to find trend extrema - basically, it is an oscillator without fixed upper and lower levels.
You can view a detailed explanation of how the indicator works here: https://www.earnforex.com/metatrader-indicators/Coppock/
Any contributions to the code are welcome!