Stands for "International Thermonuclear Experimental Reactor"
Is a fusion project by loads of countries where plasma is heated to 150 mil. degrees celsius and held in place by a magnetic field (the core of our sun is 15 mil.), to start a
nuclear fusion of
deuterium and
tritium which will generate ALOT of energy. The reactor will also be "relatively" safe since, in case of a failure, the plasma will simply cool off.