There are several synonyms for the term "thermonuclear device," which is commonly known as a hydrogen bomb or H-bomb. Other synonyms include thermonuclear bomb, fusion bomb, or simply nuke. These weapons are the most powerful in the world, using nuclear fusion reactions to release vast amounts of energy. The development of thermonuclear devices has been a major focus of many countries seeking to extend their military power. However, their use has been strictly regulated, and only a few nations possess such weapons. The threat of these devices has led to many international agreements and treaties, with the primary aim of preventing their use and minimizing the risk of nuclear war.