CNT stands for Condensed Nuclear Torpedoes. They are small spheres of highly concentrated energy burning around a casing of resistant metal filled with large amounts of nuclear explosives. The metal is programmed to detonate on contact with a target, meaning that the energy comes into contact with the nuclear concentration and a large explosion occurs.
CNT's are commonly used across the Dendrius galaxy, but were first invented by a Curodian scientist. Since then, a number of species have developed their own, slightly different versions of these powerful missiles.