Sterke Trendwissel Signalen

Overview
The indicator combines three technical analysis tools to generate strong buy and sell signals:
Moving Averages (MA): Short-term (9-period) and long-term (21-period) simple moving averages.
Relative Strength Index (RSI): A 14-period RSI to measure overbought and oversold conditions.
Volume: A volume multiplier (1.2x) compared to the average volume over 20 periods.

Signals
The indicator generates two types of signals:
Strong Buy: When the short-term MA crosses above the long-term MA (bullish crossover), the relative volume is above the threshold (1.2x average), and the RSI is oversold (< 30).
Strong Sell: When the short-term MA crosses below the long-term MA (bearish crossover), the relative volume is above the threshold (1.2x average), and the RSI is overbought (> 70).
Visualizations

The indicator plots:
The short-term MA (blue line)
The long-term MA (orange line)
"STRONG BUY" labels (green) below the bar when a strong buy signal is generated
"STRONG SELL" labels (red) above the bar when a strong sell signal is generated

Alerts
The indicator sets up alerts for strong buy and sell signals, which can be configured in TradingView's alert system.
In summary, this indicator aims to identify strong trend changes by combining moving average crossovers, high volume, and RSI overbought/oversold conditions.