Related Clues:

• Just a jot for Greek letter
• An explosive particle as in bomb
• A mighty particle for a bomb
• A tiny particle of matter with a big bang
• A mighty particle, makes huge explosion
• Ninth letter of Greek alphabet, small amount
• A mighty physical particle or bomb
• Barely detectable amount
• Greek letter and small amount
• Just a jot, or a Greek letter
• The tiniest particle
• The smallest possible amount, or the Greek i
• Bomb type
• A mighty particle, can be explosive
• The Greek i (4)