A trailing stop is designed to protect gains by enabling a trade to remain open and continue to profit as long as the price is moving in the investor's favor. The order closes the trade if the price changes direction by a specified percentage or dollar amount.
Trigger me I'm famous
I developed many trading strategies in my career and often I've been asked to trigger a trailing-stop once a certain % move has been made.
On the screenshot below, the SL trigger is plotted in maroon. Once the price goes past that level for the first time, I'll start trailing the trailing stop level. In other words, when we see a price makes an interesting move in percentage value - we decide to trail the stop for at least not losing any more