It shows Coppock with its own moving average. (Yes, in a way, 3 moving averages.)
Advised to use :
for long term, certainly not for day-trade;
on daily charts;
not as a standalone indicator, helps to read RSI, Klinger, TSI, CCI, etc.
as momentum-signaling: crossing 0, inflection points, crossover
as a quasi-centered, quasi oscillator, but not proportional...