Here's why:
* Sign languages are distinct languages: Just like spoken languages, sign languages have their own unique grammar, vocabulary, and structure. They are not simply visual representations of spoken languages.
* Regional variations: Even within a country, there can be variations in sign language. For example, American Sign Language (ASL) is different from British Sign Language (BSL).
* Historical and cultural influences: Sign languages develop independently, influenced by the history, culture, and geographic location of the deaf community.
Some examples:
* American Sign Language (ASL): Used in the United States and Canada
* British Sign Language (BSL): Used in the United Kingdom
* French Sign Language (LSF): Used in France and parts of Switzerland
* Spanish Sign Language (LSE): Used in Spain and Latin America
* Japanese Sign Language (JSL): Used in Japan
It's important to note that there is often some overlap and influence between sign languages, but they are fundamentally distinct from one another.