a 8-bar Donchian Channel | "every 8 days new low" indicator

 There is no single built-in "every 8 days new low" indicator on TradingView, but traders typically track this using a 8-bar Donchian Channel or a custom Pine Script that flags when the current price drops below the lowest low of the last 8 trading sessions. 

How to set up an 8-Day New Low

You can easily visualize an 8-period low on any chart (such as 1D for days, 1H for 8 hours, etc.) by using the built-in Donchian Channel:

1. Open a chart and click the Indicators button at the top.
2. Search for Donchian Channels and add it to your chart.
3. Open the indicator's Settings and change the Length to 8.
4. Uncheck the Upper and Basis lines so only the lower band remains. This line will dynamically update to show the absolute lowest point of the past 8 periods.