It identifies stop loss exit points for long and short trading positions.
Configuring the ATR period = 1 and Multiplier = (say) 1.25 or 1.5, it can be used for readily available buffer Stop Loss value from previous high/low.
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.