A "Trix" (or TRIX) is a technical analysis indicator used in trading, specifically a triple-smoothed exponential moving average oscillator. It was developed by Jack Hutson in the 1980s. TRIX calculates the percentage change in a moving average that has been smoothed exponentially three times, designed to filter out insignificant price movements and show the momentum or trend direction of an asset. TRIX values oscillate around a zero line; positive values indicate bullish momentum, negative values indicate bearish momentum, and crossing the zero line suggests a potential trend change. It is used both as a momentum indicator and an oscillator to identify overbought or oversold markets and generate trading signals. TRIX is calculated by applying an exponential moving average (EMA) three times and then computing the percentage rate of change of the final smoothed average. In summary, TRIX helps traders identify trends, momentum strength, and potential reversals by smoothing out price fluctuations using a triple EMA calculation.

Additionally, "Trix" can refer to a Latin suffix used to form feminine nouns or adjectives, but in this context, it most commonly relates to the trading indicator.