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Multiple Meanings Exist...?
Military code D5, Trident II Missile
The Trident missile is a submarine-launched ballistic missile equipped with multiple independently targetable reentry vehicles. Originally developed by Lockheed Missiles and Space Corporation, the missile is armed with thermonuclear warheads and is launched from nuclear-powered ballistic missile submarines.
https://www.acronymfinder.com/D5.html
https://en.wikipedia.org/wiki/Trident_(missile)