A form of propulsion that uses Ion as a form of exhaust.
Ion Propulsion is a form of Electrical Propulsion which creates thrust by accelerating ions. It generally uses magnetic forces to traps electrons and mix them with a highly ionized fuel which in turns is forced out in ion form. Another form is the direct expulsion of ions. Either way creates thrust that pushes a vessel.
Like many technology the appearance varies upon who built it, but each one always appears as an LED spewing out particles.