Nuclear Arms Control: Nuclear arms control refers to agreements between nations aimed at reducing or limiting the number and types of nuclear weapons possessed by countries.
Ballistic Missile: A ballistic missile is a long-range weapon that follows a parabolic trajectory after being launched into space. It carries warheads and can be used for offensive purposes.
Anti-Ballistic Missile (ABM) Treaty: The ABM Treaty was an agreement between the United States and Soviet Union signed in 1972. It limited each side's development of anti-ballistic missile systems, including those like SDI.