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Number 3 may refer to:

• The Bourne Ultimatum (novel) -- the third novel
• The Bourne Ultimatum (film) -- the third film
• LARX-3 -- the subject of the LARX project
• Outcome-3 -- the third subject of the Outcome project
• Treadstone-3 -- the third subject of Treadstone
• Blackbriar-3 -- the third subject of Blackbriar
• Emerald Lake-3 -- the third subject of Emerald Lake project