By default :
Green Label - previous 1 day high
Yellow Label - previous 1 week high
Red Label - previous 1 month high
Each number and color can be change in setting.
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.