Related Clues:

• Something to stand for
• Patriotic song
• World Series opener
• Foible
• First of three in a pencil/paper game
• It could be represented by an "X"
• Pregame ritual
• It's played before play begins
• Persistent personal quirk
• ___-tac-toe
• First O?
• Choral work
• Church song
• Quirky behavior
• The first O of O-O-O