The QQE (Quantitative Qualitative Estimation) indicator is a technical analysis tool that combines aspects of the Relative Strength Index (RSI) with a smoothed moving average to create a trend-following momentum indicator. Developed by Wilde, QQE aims to identify potential buy and sell signals by analyzing price action and market trends. It features two main lines: a signal line, derived from the smoothed RSI, and a QQE line that helps traders spot overbought or oversold conditions. When the QQE line crosses above the signal line, it may indicate a bullish signal, whereas a cross below could suggest a bearish trend.