law: Standards of Weights and Measures Act, 1976 
  13. Base unit of
  
  numeration. - 
  (1) The base unit of 
  
  numeration shall be the unit of the international form of Indian numerals.
  (2) Every numeration
  
  shall be made in accordance with the decimal system.
  (3) The decimal
  
  multiples and sub-multiples of the numerals shall be of such denominations and
  
  be written in such manner as the Central Government may, after previous
  
  publication, specify by rules made in this behalf:
  Provided that no such rule
  
  shall be made before the expiry of six months from the date on which the draft
  
  of the proposed rules was first published in the Official Gazette.