Use of Separators
The Indian numbering system uses separators differently from the Arabic system; besides the three least significant digits of the integer part, a comma divides every two rather than every three digits, thus:
| Indian System | Arabic System |
|---|---|
| 5,05,000 | 505,000 |
| 12,12,12,123 | 121,212,123 |
| 7,00,00,00,000 | 7,000,000,000 |
This accords with the Indian numbering system, which has units for thousand, hundred thousand, ten million, etc.
Read more about this topic: South Asian Numbering System