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The famous digits which are being used worldwide are invented by Muslim Arabs. These numbers are written as 0, 1, 2, 3,..., 9. They are called dictionaries as 'Arabic digits '. The philosophy behind these digits is that the number is represented by the same number of angles in the written form. For example, the number zero is of zero number of angles, the number 1 is having one angle, the number 2 is having two angles, and so until number 9 has nine angles. Try them as it is very interesting to understand for example why we write number 7 with a horizontal dash in the middle.

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Q: How did Arabic numerals get their shape?
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