I use this as a numerical sign of vigour in a trend and hence it acts as one filter for me on the decision to enter a position. e.g. a rise of 5% is more vigorous than 2%. I might use a filter of no entry if < 2% on the candle in the time period of interest.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.