3 points
Keys for opening doors, driving etc. Also for defense…My brother got jumped by a group of teens in college. They came up behind, shoved him down. To defend himself, he pulled out his keys and slashed one in the face. They didn’t expect him to do that and took off running. They only got a cheap phone from the ordeal and not his backpack which had expensive books and a laptop in it. I always have my keys on me now.