1. Sign language is not universal: Just like spoken languages, there are different sign languages used around the world. American Sign Language (ASL) is different from British Sign Language (BSL), for example.
2. Sign language is a complete language: It has its own grammar, syntax, and vocabulary, just like any other language. It's not just a series of gestures.
3. Sign language is visual and spatial: It relies on handshapes, facial expressions, and body movement to convey meaning. This makes sign language particularly engaging and expressive.