* Sign languages are distinct languages. They have their own grammar, vocabulary, and structure, just like spoken languages.
* Sign languages developed independently. They weren't created based on spoken languages, but arose naturally in deaf communities.
* There are many sign languages around the world. Some countries have multiple sign languages, while others share a sign language with neighboring countries.
* There are also "international" sign languages used in specific contexts, like the International Sign language used at deaf events and conferences.
While a spoken language might have a "signing system" to accompany it, this is not a true sign language. A signing system is essentially a set of gestures that represent specific words, but it lacks the complex grammatical structure and independent development of a sign language.
In conclusion, while spoken languages are numerous, sign languages are often regional and develop independently.