Related Clues:

• Greek character has gas? I'm off!
• Greek character writing name (Martin?) backwards, minimum of Greek in it
• In the morning soldiers knocked over character in Athens
• Letter before tau
• Summation symbol, in math
• Letter before 7-Down
• Sophocles's initial, to Sophocles
• What sounds like a fag, postgraduate producing letter in Greek
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• What Archimedes was finished with
• Symbol in Greek, merely alphabetical initially
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• Eighteenth Greek letter
• Greek "s"
• Greek letter which means “sum” in maths