Metaweapon is a term used to describe certain types of weapons of mass destruction used in space, most notably an isolytic subspace weapon.
History and specifications[]
In the early 24th century, tensions between the Klingons, the Romulans, and the Federation were running high while the three powers tried to come up with an agreement that would ban these weapons. (ST - The Lost Era novel: Serpents Among the Ruins)