Henniker Sign Language was a village sign language of 19th-century Henniker, New Hampshire and surrounding villages in the US. It was one of three local languages which formed the basis of American Sign Language. Although the number of students from Henniker were fewer than speakers of the more famous Martha's Vineyard Sign Language, deafness in Henniker was genetically dominant, and Henniker SL was therefore likely to have been better developed than MVSL.
Lane, Pillard, & French, "Origins of the American Deaf-World: Assimilating and Differentiating Societies and Their Relation to Genetic Patterning". In Emmorey & Lane, eds, The Signs of Language Revisited, 2000
^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.
