Swedish Sign Language family
|Swedish Sign Language|
|Linguistic classification||? British Sign|
Swedish SL started about 1800. Wittmann (1991) proposes that it descends from British Sign Language. Regardless, Swedish SL in turn gave rise to Portuguese Sign Language (1823) and Finnish Sign Language (1850s), the latter with local admixture; Finnish and Swedish Sign are mutually unintelligible.
There are no known dialects in the Swedish Sign Language, however, it is partly intelligible with other manual languages such as Danish (DSL), Norwegian (NSL), and Finnish (FSE). 
Finnish-Swedish Sign Language (FinSSL)
The Finnish-Swedish Sign Language, also known as FinSSL, was created by the deaf community of Swedish backgrounds inhabiting the coastal areas of Finland. It is declared as an independent language given the connection to the Finland-Swedish culture.
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin, eds. (2017). "Swedish Sign". Glottolog 3.0. Jena, Germany: Max Planck Institute for the Science of Human History.
- Wittmann, Henri (1991). "Classification linguistique des langues signées non vocalement." Revue québécoise de linguistique théorique et appliquée 10:1.215–88.
- "Swedish Sign Language". Ethnologue. Retrieved 2017-09-06.
- Jepsen, Julie (2015). Sign Languages of the World: a Comparative Handbook. De Gruyter.
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