Doomsday machines refer to devices or weapons that can bring about the end of the world or the destruction of civilization. Some of the synonymous terms for doomsday machines include apocalypse devices, armageddon weapons, end-of-the-world contraptions, global annihilation tools, ultimate destruction devices, world-ending apparatuses, and extinction mechanisms. These terms emphasize the destructive power of these weapons and the catastrophic consequences they can have on human existence and the planet as a whole. While doomsday machines are often the stuff of science fiction, the potential for such devices to exist in reality underscores the importance of international efforts to prevent nuclear proliferation and ensure global peace and security.