* Sign languages are diverse: Just like spoken languages, there are many different sign languages around the world, each with its own unique grammar, structure, and vocabulary.
* Specific names: Each sign language has its own name. For example, the most common sign language in the United States is called American Sign Language (ASL), while the most common sign language in the UK is called British Sign Language (BSL).
* "Sign language" as a general term: You can use the term "sign language" as a general category to refer to any language that uses signs, gestures, and facial expressions as its primary means of communication.
So, when you say "sign language," be specific about which language you're referring to.