How the orgin or invention of number came into extistence have you ever been think.
Here is the answer the numbers we use to write are made up of algorithms.These algorithms are called as arabic algorithms.
These algorithms was popular in arab.
So Here in Images the answer is these algorithms wriiten in angles.

1 , 2 , 3 ,4 

As you see in image , 1 make 1 angle , 2 makes 2 angles , same like that 3,4 makes 3 and 4 angles .

Here is more for 

So same like that for 9

At last see 0 has zero angles ,

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