Many years ago, I was reading in Thiaoouba Prophecy book by Michael Desmarquet. A very nice book.
Anyway, in that book, there was a mention about numbers and why they are written the way they are. The alien in the book explains that the numbers are written like this because of the number of angles each number have:
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Amazing way to write numbers! But the Zero is not same like the rest!
Yes, zero has no angles 🙂