Irish Sign Language (ISL), which is different from North Irish Sign Language (NISL), is descended from LSF (French Sign Language). Whereas, NISL is a dialect of British Sign Language.
Janzen, Terry. Topics in Signed Language Interpreting. "Vying with variation: Interpreting language contact, gender variation and generational difference" by Lorraine Leeson. Pp 251-292. Amsterdam/Philadelphia: John Benjamins Publishing Company.
Related posts: North Ireland Sign Language.
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