This is a double smoothed stochastic RSI . Stoch RSI is a very good indicator but it can sometimes give the trader false indications because of its jagged (noisy) motion. There is a lot of filters out there that can give a good result but it very often it also adds unacceptable lag. And lag is delaying your decision-making.
This filter is ideal to clean up common technical indicators like stoch RSI , Willams %R or whatever your favorite oscillator you have. The chart here is just an example for demonstrating purposes. But it gives the user a visual representation of how it can look like. And it works on all time frames and markets you can think of...