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There are perhaps three hundred sign languages in use around the world today. The number is not known with any confidence; new sign languages emerge frequently through creolization and ''de novo'' (and occasionally through language planning). In some countries, such as Sri Lanka and Tanzania, each school for the deaf may have a separate language, known only to its students and sometimes denied by the school; on the other hand, countries may share sign languages, though sometimes under different names (Croatian and Serbian, Indian and Pakistani). Deaf sign languages also arise outside of educational institutions, especially in village communities with high levels of congenital deafness, but there are significant sign languages developed for the hearing as well, such as the speech-taboo languages used in aboriginal Australia. Scholars are doing field surveys to identify the world's sign languages.〔Woodward, James. 1991. The relationship of sign language varieties in India, Pakistan, and Nepal. ''Sign Language Studies'' 78: 15-22.〕〔Parkhurst, Stephen and Dianne Parkhurst. 1998. Introduction to Sign Language survey. ''Notes on Sociolinguistics'' 3: 215-42.〕〔Ciupek-Reed, Julia. 2012. Participatory methods in sociolinguistic sign language survey: A case study in El Salvador. University of North Dakota MA thesis. (Ciupek-Reed's thesis )〕〔Russell R. Aldersson and Lisa J. McEntee-Atalianis. 2007. A Lexical Comparison of Icelandic Sign Language and Danish Sign Language. ''Birkbeck Studies in Applied Linguistics'' 2 (Icelandic & Danish Sign Languages )〕 The following list is grouped into three sections: *Deaf sign languages, which are the preferred languages of Deaf communities around the world; these include village sign languages, shared with the hearing community, and Deaf-community sign languages *Auxiliary sign languages, which are not native languages but sign systems of varying complexity, used alongside oral languages. Simple gestures are not included, as they do not constitute language. *Signed modes of spoken languages, also known as manually coded languages, which are bridges between signed and spoken languages The list of deaf sign languages is sorted regionally and alphabetically, and such groupings should not be taken to imply any genetic relationships between these languages (see List of language families).〔For a classification, see Wittmann, Henri (1991). "Classification linguistique des langues signées non vocalement." Revue québécoise de linguistique théorique et appliquée 10:1.215-88.(PDF )〕 ==Sign Language List== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of sign languages」の詳細全文を読む スポンサード リンク
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