Final answer:
START stands for Strategic Arms Reduction Treaty, which was passed in 1991.
Step-by-step explanation:
START stands for Strategic Arms Reduction Treaty, which was passed in 1991. This treaty was signed between the United States and Soviet Union and aimed to reduce the number of nuclear weapons possessed by both countries. It was an important step towards nuclear disarmament and showed a willingness from both nations to limit the production of weapons of mass destruction.
Learn more about Strategic Arms Reduction Treaty