The term "reaction" is used in reference to a type of OverTechnology described as pair-annihilation. The Reaction Engine (often called thermonuclear reaction engine) is an excellent power source of extreme efficiency since it is not necessary for the fuel to be nuclear material and the reaction is easily maintained in a plasma state through the use of super dimension spatial theory. Reaction weapons using pair-annihilation via OverTechnology produce high energy destructive effects even greater than those of nuclear weapons. The use of nuclear weapons was considered a taboo for Japanese television at the time of the original Macross television series (1982) so the term "reaction" was used instead since, as Shoji Kawamori noted, there can be no protestors to pair-annihilation weapons since they do not yet exist.