Related Clues:

• '___ Game' (1986 Hugo Award winner)
• Literally, 'great O's'
• Last letters heading off from Rome reflected decline
• Final letters
• Alphas' counterparts
• Final letters, in Athens
• 'w'-like letters
• Conclusions of ball games being played
• High-end watches featuring a Greek letter
• Final letters backed wise work plan
• Letters in some message mostly taken the wrong way
• Greek letters that look like horseshoes