Triple Exponentially (TRIX) is a momentum indicator that displays the percent rate-of-change of a triple exponentially smoothed moving average of the security's closing price. The main purpose of the TRIX is to keep investors in trends equal to or shorter than the number of periods specified in order to filter out stock movements that are insignificant to the larger trend of the stock.
The TRIX is considered a leading indicator and can be used to anticipate turning points in a trend through analysis of its divergence with the share price. Likewise, it is common to plot a moving average with a smaller period (such as 9) and use it as a "signal line" (as per MACD) to anticipate where the TRIX is heading. TRIX line crossovers with the "signal line" can also be used as buy/sell signals.