A journal to keep all there caculations of the kind of person Arithmancy would show them to be. Whether it actually be true or not was up in the air. She remembered that last year she thought she could'nt be the number 1 but found out all the charms of that number she never saw before. Having a journal would truly open the door to be able to look back and find the charms od you're numbers and what they make a person. This was gonna be awesome.