Sudan and South Sudan have multiple regional sign languages, which are not mutually intelligible. A survey of just three states found 150 sign languages, though this number included instances of home sign. By 2009, the Sudanese National Union of the Deaf had worked out a Unified Sudanese Sign Language, but it had not yet been widely disseminated.
^a Sign-language names reflect the region of origin. Natural sign languages are not related to the spoken language used in the same region. For example, French Sign Language originated in France, but is not related to French. Conversely, ASL and BSL both originated in English-speaking countries but are not related to each other; ASL however is related to French Sign Language.
^b Denotes the number (if known) of languages within the family. No further information is given on these languages.
