Thermonuclear weapon
Modern fusion weapons consist essentially of two main components: a nuclear fission primary stage (fueled by U-235 or Pu-239) and a separate nuclear fusion secondary stage containing thermonuclear fuel: the heavy hydrogen isotopes deuterium and tritium, or in modern weapons lithium deuteride. For this reason, thermonuclear weapons are often colloquially called hydrogen bombs or H-bombs.
Thermonuclear weapon-2