law: Cost and Works Accountants Act, 1959 
  7. Members to be known as cost accountants 
  Every member of the Institute in practice
  
  shall, and any other member may, use the designation of a cost accountant and
  
  no member using such designation shall use any other description, whether in
  
  addition thereto or in substitution therefor:
  PROVIDED  that nothing in this section shall be
  
  deemed to prohibit any such member from adding any other description or letters
  
  to his name, if entitled thereto, to indicate membership of such other
  
  Institute of accountancy, whether in India or elsewhere, as may be recognized
  
  in this behalf by the Council, or any other qualification that he may possess,
  
  or to prohibit a firm, all the partners of which are members of the Institute
  
  and in practice, from being known by its firm name as cost accountants.