dadpad, In my lazyness, I made some assumptions such as "arabic numbers," because that's what we were taught in school. In the email I rec'd from a friend, somebody he knows explained how the "arabic" number were designed; it was based on the number of angles. I could not cut and past from the attachment in my email so I got lazy and posted the link from Wiki. Sorry that my laziness caused so many problems with this post. shame on me! and sorry! especially since I try to add good info on a2k to expand our knowledge.
If you can send me your email address by PM, I can forward the email to you, and you can post the link that explains the development of the "arabic" numbers, and the explanations that I misinterpreted.