N.H. Rev. Stat. Ann. § 656:12

At the end of the list of candidates for each office, there shall be left as many blank lines as there are offices to be filled which a voter may use to write in the name of any person for whom the voter desires to vote. In cities and towns where an electronic ballot counting device is used for the counting of ballots, as provided in RSA 656:40, there shall be a square, box, oval, or other appropriate symbol for directing the voters where to make the appropriate mark directly to the right of each blank line.