No, it means Nissan doesn't require replacing the nut unless it's damaged. When stuff is flagged "single-use" on the exploded diagrams in the ESM, it should be replaced anytime you remove it. In fact, if we do a warranty repair that requires single-use parts and they aren't all billed out on the repair ticket, Nissan will kick back the entire job and refuse to pay for it. Serious stuff if the single-use part happens to be a $0.05 cotter pin and the replaced part is a $400 axle.