Dodik asks a question about this.
First, all languages in the world share the 12 characteristics.
Second, the universality of language refers to the fact that most language in the world share common rules, patterns, or rules. However, language is also so unique that each language has some features that cannot be found in any other language.
Third, universal language refers to a language that is used by a great number of people in the world. It is believed that Sanskrit used to be a universal language. Arabic can be called as a universal language because all moslems in the world use Arabic in their Koran, or even prayers. Please read wikipedia for more ideas about universal language.