How much the price rose or fell over the last n candles, in %.
Useful as a simple momentum filter: only buy coins that went up over the last month.
Worked out by the same code the builder uses, on stored daily candles. Move a setting and the line moves with it. This is what happened, not what will happen.
Gate: Return %(30) [1d] is above 0.
Past return says little about the next candle; as a filter it keeps you out of falling markets, which is its real job.
No indicator predicts the market on its own. Build the rule, then test it on years of history with fees included. Try TradeXtool free for 14 days.