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There is no general category for "defensive nuclear weapons" although they were once envisioned as part of an air-defense against massed bombers. The 3 letter acronym for a "defense against nuclear missiles" is ABM, which stands for Anti-Ballistic Missile defense.

(There is a related acronym from the Cold War, MAD, for Mutual Assured Destruction, a policy to preclude a first strike in nuclear war by assuring the survival of retaliatory weapons.)

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7y ago

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