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Is there a reasoning behind the depiction of the numbers as they are: $\{1,2,3,4,5,6,7,8,9\}$

Is there any other form of depiction for $6$ and $9$ other than $VI$ and $IX$?

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    it's Japanese too.2012-08-22

3 Answers 3

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The image below depicts numbers in Japanese.

enter image description here

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The first few are derived from ways to make $n$ marks.

http://en.wikipedia.org/wiki/Arabic_numerals#Origins

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At this link you’ll find links to descriptions of almost three dozen numeral systems. Some of them share a common origin with our familiar numerals $0,1,\dots,9$, and some are completely different in origin. The Brahmi numerals are the direct graphic ancestors of our numerals; as you can see from the picture there, the first three were basically just tally marks, but the rest have no obvious pictorial significance.