Related Clues:

• The Greek i (4)
• A small but mighty particle
• Small letter, ninth in the Greek alphabet
• A very powerful particle
• Just a jot, like Greek letter
• A tiny particle but a big bomb
• Very small amount for a Greek letter
• 'Very small amount, jot (4)'
• Neutron and proton
• It means very little to come during the morning
• Thank you for the ten - even though it's so little
• A tiny ten, thank you
• So little would enable one to talk turkey
• Very little thanks with ten
• Is there a trace of this up for ABCDEFGHI?