Section 63(7)(a) in The M.P. Nagarpalika Nirvachan Niyam, 1994
(a)the voter may record his vote by making a mark (like V or x) anywhere in the space allotted to the candidate for whom he wants to vote. There is no particular mark required to be made; any mark can be accepted as valid so long as the intention of the voter to vote for a particular candidate is clear beyond any reasonable doubt and the identity of the voter is not disclosed by such mark;