Tradingview.com | Indicator: WaveTrend Oscillator [WT]

Here is the article. 

WaveTrend Oscillator is a port of a famous TS/MT indicator.
When the oscillator is above the overbought band (red lines) and crosses down the signal (dotted line), it is usually a good SELL signal. Similarly, when the oscillator crosses above the signal when below the Oversold band (green lines), it is a good BUY signal.