Related Clues:

• They often go in boxes
• Indications of good bowling
• Strike marks
• Kisses, symbolically
• Kisses, on paper
• Scratches, with 'out'
• Tic-tac-toe lineup, sometimes
• Check alternatives
• __ out (cancels)
• Yeses and nos, maybe
• Test marks, maybe
• Choice marks?
• No-frills signatures
• Ballot choices
• Strikes through, as text