The nsibidi signs for numbers are from the representations of the amount of certain objects, the most common of these objects were rods, which were used as money in the days before European contact. The '5' was from an early source for nsibidi, as many of you probably know, this is a common way of writing down numbers amongst most world cultures. To differentiate numbers from rods, the bars at the end of the lines were removed. The characters pretty much explain themselves.
EDIT: Everyday numbers will be in Hindu Arabic script. 1234567890. The numbers posted here are just for special occasions and to preserve the original numbers.
