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.

A quote currency, also known as a secondary currency, is the currency that is quoted in relation to another currency in a currency pair. For example, in the currency pair EUR/USD, the USD is the quote currency because it represents how much of the USD is needed to purchase one unit of the EUR. In trading, understanding the quote currency is essential for calculating exchange rates and potential profits or losses in foreign exchange transactions.