Page "Arabic numerals" Paragraph 6

The digits 1 to 9 in the Hindu-Arabic numeral system evolved from the Brahmi numerals.

Buddhist inscriptions from around 300 BCE use the symbols which became 1, 4 and 6.

One century later, their use of the symbols which became 2, 7 and 9 was recorded, but Brahmi numerals lacked a symbol for 0.