Section 2(1)(i) in The Representation of the People (Miscellaneous Provisions) Act, 1956
(i)"sign", in relation to a person who is unable to write his name, means authenticate in such manner as may be prescribed[Clause (k) re-lettered as clause (i) of that section by Act 27 of 1956, s. 3 (w.e.f. 28-8-1956)].