This indicator can be used to spot unusually large or small candles. And can also be used for testing other strategies or indicators related to candle sizes.
This can be used so you can see a lower timeframe yet still know what the candle size or average candle size is on higher time frames.
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.