Related Clues:

• Greek letter that represents 10-Across, in physics
• Zed : England :: ___ : Greece
• The end of my eight gates ajar, all opening
• Greek letter is nothing fantastic
• What Columbo ends with: great series finale
• Conclusion drawn from income gap
• The end — nothing very big
• The conclusion
• Greek alphabet's conclusion
• Final letter of the Greek alphabet
• Greek character held by loathsome gang
• NASA-approved watch brand
• Sorority "O"
• Old giant, Greek character
• Letter from Greece, and some from e.g. Argentina