Related Clues:

• Scratches, with 'out'
• Tic-tac-toe lineup, sometimes
• Check alternatives
• __ out (cancels)
• Yeses and nos, maybe
• Test marks, maybe
• Crosses off
• Choice marks?
• No-frills signatures
• Ballot choices
• Makes one's mark, maybe
• Pornography letters
• Letters on coaches' chalkboards
• Marks, as a ballot box
• Characters in pornography?