Русско-англо-русский юридический словарь

voting slip: a piece of paper on which people mark who they want to vote for in an election and then put into a box in order to vote for that person (Cambridge Advanced Learner's Dictionary & Thesaurus)

On entering your polling station you will need to provide your name and address, after which you will be given a voting slip.

Head to a booth and mark your cross against the candidate you wish to vote for.

Keep your voting slip private, fold it and place it in the ballot box. (The Sun)