Section 4(2) in Legal Metrology (Numeration) Rules, 2011
(2)While writing in accordance with English terminology, any number in digit exceeding three, the deCimal point shall be taken as the starting point and the digits, whether to the left or to the right of the decimal point, shall be divided into groups of three, starting from the decimal point and neither dots nor commas shall be inserted in the spaces intervening between such groups of digits.Example: 123 345.732 456.
