Many years ago, when we used to drop our kids off at childcare during church, we would keep track of their name tag stub by writing J1, J2, J3, or J4 on it. All of our children's names start with the letter J. So J3 is for our third oldest child who enjoys caching with the family. She once went on a caching date with her dad that had to be cut short because she was sick. She didn't want to stop!