This is the Center of Gravity Trigger (CG Trigger) oscillator indicator described in Chapter 5.  The Trigger indicator is created by delaying the Center of Gravity indicator by one bar.  It may be combined with the Cyber5_CG indicator to create a trading system.

PriceIn - defaults to Close but change to the Price indicator to match the book

Length – defaults to 8 but Ehlers’ also uses a value of 10.  This indicator is very sensitive to the length parameter

For more information on this indicator and how to set the length parameter, refer to Chapter 5 of "Cybernetic Analysis for Stocks and Futures" by John Ehlers, Publisher: John Wiley & Sons; (March 19, 2004), ISBN: 0471463078.