This afternoon, I happened upon an article that I found once before. Speaking of the Director of the Jamaica Association of this Deaf, it says:
JAD Executive Director Iris Soutar said JSL’s use differed from regular sign language given its unique use of several facial expressions and body language employed to communicate information to deaf students.
See that? JSL is different from “regular” sign language. Mrs. Soutar knows JSL, so I doubt the error is her own. Most of us believe that (regular) sign language is similar to what is called “Signed English”, a representation of the English language with purely manual (hand) signs. JSL, ASL, and other natural Deaf sign languages use manual and non-manual signs (or at least signs with non-manual aspects).
That is regular. SMH.