Related Clues:

• What two heads are better than
• "A Chorus Line" number
• Cardinal number
• Fifth single digit, alphabetically
• Its square root is itself
• 4/4
• "The loneliest number," in a 1969 hit
• Brando's ''The Wild ___''
• 'That ___'
• Penultimate countdown word, often
• Solid yellow billiard ball
• Deep sadness
• Low end of many scales
• ''By the time I count to three'' follower
• Area code preceder for some