There is no "language of the blind"; "Braille" is a writing system which is used to write various languages. "Hieroglyphics", similarly, is not a language; it is also a writing system, used to write Egyptian languages.
"Sign language", in contrast, does not exist at all, per se, as "the language of the deaf". It has the same status as "spoken language", which is to say that it's a kind of language, but "American Sign Language" is a different language than "British Sign Language", etc. |