The Coppock curve or Coppock indicator is a technical analysis indicator for long-term stock market investors created by E.S.C. Coppock, first published in Barron's Magazine in October 15, 1962.
The indicator is designed for use on a monthly time frame. It's the sum of a 14-period rate of change and 11-period rate of change, smoothed by a 10-period weighted moving average. - Read more on Wikipedia