What does ZX mean in Kawasaki?

Could you please clarify what the abbreviation "ZX" stands for in the context of Kawasaki? Is it referring to a specific model, technology, or perhaps a naming convention used by Kawasaki? It would be helpful to know if there's a particular product or service from Kawasaki that this abbreviation is associated with, as it could vary depending on the specific context. Could you provide any additional information to narrow down the meaning of "ZX" in Kawasaki?