This indicator measures the vertical distance form the current close to the MA of your choice. I find that it does not work best as an oscillator, but it works well for providing early signals for taking profits when trend continuating. For example, if you go short due to a retracement to the MA (of your choice) take profits when a bearish trendline is broken...
This is a simple script to quickly see changes in % in each candle.
In blue open/close variation. In red Histogram with range between high and low.
This helps me understand very quickly what's the typical change in % for a specific timeframe/pair, so I can fine tune my Stop Losses and Take Profits.