The Ennead Numbers are the numbers 1-9. They are special because, along with zero, they can create all other numbers.
Root Numbering[]
Numbers can be "rooted" down to a single digit when the digits are adding together enough times. For example, the number 153 roots to 9 because 1 + 5 + 3 = 9. The number 1932 roots to 6 because 1 + 9 + 3 + 2 = 15 and then 1 + 5 = 6.