Not uniquely: Serbo-Croatian is written in Latin or Cyrillic depending what country you are in. Turkish is now officially written in Latin, but used to be writt

Not uniquely: Serbo-Croatian is written in Latin or Cyrillic depending what country you are in. Turkish is now officially written in Latin, but used to be written in Arabic. And most prominently, though in a different way, Chinese and Japanese have multiple writing systems.