Languages attested from the 1980s

sign language used in Nicaragua

controlled language developed to help users of maintenance documentation

IsiNgqumo, or IsiGqumo, (literally "decisions" in the language itself) is an argot used by homosexuals of South Africa and Zimbabwe who speak Bantu languages, as opposed to Gayle, a language used by the homosexuals of South Africa who speak Germanic languages. IsiNgqumo developed during the 1980s. Unlike Gayle, IsiNgqumo has not been thoroughly researched or documented, so figures on numbers of speakers are nonexistent.