Here are a couple of common ways to sign "good luck" in American Sign Language (ASL):
* "Good luck" sign (similar to a wish): This sign is made by touching the tip of your thumb to your chin and then sweeping your hand outward. It's often used in a similar way to wishing someone well.
* "Good luck" sign (with the fingerspelling "L" and "U"): This sign involves signing "L" (with your index finger pointing up) and then signing "U" (with your hand open, palm facing outwards) while slightly shaking your hand.
It's important to remember that sign language is visual and can vary depending on the regional dialect, the context, and even the individual signer.
If you're learning sign language, it's best to learn the signs from a qualified instructor or resource specific to the sign language you are learning.