An R-multiple expresses a trade result as a multiple of the risk taken, where one R equals the planned loss from entry to the initial stop. A gold trade that returns twice its risk is plus two R and a clean stop-out is minus one R, which makes outcomes comparable regardless of lot size or account balance.
This matters more on XAUUSD than on most instruments because gold stop distances vary widely with volatility, from a few dollars in a quiet week to double digits around FOMC. Measured in dollars those trades cannot be compared; measured in R they can. R must be anchored to the stop set at entry, and slippage beyond the stop should be recorded as worse than minus one R rather than rounded back.