For the deaf, a person used the finger language /the sign language.

(Is this one correct? Which expression is correct, finger language or sign language? Thank you.)

The term is "sign language."

You could write it in any of these ways. Remove "the" in front of "sign language."

Many deaf people use sign language.

To communicate with a deaf person, sign language works well.

Both "finger language" and "sign language" are terms used to describe the language used by the deaf community to communicate. However, "sign language" is the more commonly accepted and widely used term. It is important to note that sign language is not simply a direct translation of spoken language into finger movements, but it is a distinct and complete language with its own grammar and syntax.

To find out the correct expression, you can use various techniques. One way is to consult reliable sources such as dictionaries, scholarly articles, or reference books that specifically focus on sign language. These sources will give you the most accurate and up-to-date information on sign language terminology.

Additionally, you can also consider reaching out to experts in the field, such as linguists or professionals who work with the deaf community, to obtain their insights and recommendations on the correct terminology to use.

Overall, it is always advisable to use the term "sign language" when referring to the language used by the deaf community, as it is the widely recognized and accepted term.