This indicator is a trailing stop system along with a trend confirmation. When the blue line falls below the black line, that is a confirmation of a down trend and when it rises above the black line, it is a confirmation of an up trend. When the trender line is above the price, then that means the stock is in a general down trend and vice versa. I have color coded the trender line to show you when to buy or sell that stock to keep it easy.
This was a special request so let me know if you want to see more scripts from me or if you want something custom!
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.