Rennellese Sign Language
Rennellese Sign Language is an extinct form of home sign documented from Rennell Island in 1974. It was developed about 1915 by a deaf person named Kagobai and used by his hearing family and friends, but apparently died with him; he was the only deaf person on the island, and there never was an established, self-replicating community of signers. Accordingly, in January 2017 its ISO 639-3 code was retired. Kuschel, the only source of information about this communication system, cites no evidence to suggest that there was any contact with any sign language.
