Related Clues:

• Strikes (out)
• Primitive signatures
• Deletes, with 'out'
• Ballot markings
• Spot markers
• Doesn't check?
• Symbols of smut
• Tic-tac-toe symbols
• Signs simply
• They often go in boxes
• Indications of good bowling
• Strike marks
• Kisses, symbolically
• Kisses, on paper
• Scratches, with 'out'