Related Clues:

• Mathematician’s summation symbol
• Greek character American soldiers backed
• Symbol of stock volatility
• American soldiers in retreat showing character
• Greek letter between rho and tau
• Liberal leaves Indian city, securing good character in Patras?
• Greek letter that symbolizes summation
• Greek letter pronounced like "s"
• Greek "S"
• Scylla's head?
• Greek letter that means "sum" in math
• Successful and independent man, in slang
• Greek letter on the AutoSum button in Excel
• Symbol of statistical deviation