Related Clues:

• Finger
• Number
• Finger, say
• Part of 44-Across
• It can be improved by 39-Across
• Two or three
• One, for one
• Number component
• It may be Roman or Arabic
• It can be Roman
• Number unit
• Number part
• 3 or III, e.g.
• X, at times
• 'Far out, man!'