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The positional decimal numeral system which we use today is called 'Hindu Numeral system (or commonly Hindu-Arabic numeral system because Arabs learnt from India and popularized in other parts of the world)' was invented around 1st to 4th centuries by Indian Mathematician.

These symbols for writing numbers can be seen in Brahmi Scripts too. They grown into different typographical varient. The Indian numerals in various scripts are used in the Indian subcontinent.

In early 6th century, Āryabhaṭa introduced the modern number system which we use today, in the first chapter titled Gītika Padam of his Aryabhatiya book.

In this article numbers are written in Sanskrit.

Devnagari Digits Varients
Some digits have varient based on geographic locations and are in use.