Lucky (GURPS) is one of Fallout GURPS advantages. See: Fallout GURPS.
Some people are just born lucky. Once per hour of play, you may reroll a single bad die roll twice (this must be the last roll you made) and take the best of the three rolls! If the GM is rolling (e.g., to see whether a certain NPC arrives, or to see if you notice something), you may tell him you are using your luck, and he must roll three times and give you the best result.”— Steve Jackson Games GURPS sources
With the abandonment of GURPS, Lucky (GURPS) was merged into Luck as an attribute. Image unused.