Section 20(2)(a) in The Chartered Accountants (Election to the Council) Rules, 2006
(a)shall place on his ballot paper the number 1 (in Arabic [*] [Omitted 'or Roman' by Notification No. G.S.R. 796(E), dated 23.8.2018 (w.e.f. 5.9.2006).] numerals [*] [Omitted 'or in words' by Notification No. G.S.R. 796(E), dated 23.8.2018 (w.e.f. 5.9.2006).]) in the square opposite the name of the candidate for whom he desires to vote; and