Northern Ireland Sign Language

Northern Ireland Sign language is a sign language used mainly by deaf people in Northern Ireland.
NISL is described as being related to Irish [Sign Language] at the syntactic level while the lexicon is based on British Sign Language and American Sign Language.
A number of practitioners see Northern Ireland Sign Language as a distinct and separate language from both BSL and ISL though "many 'Anglo-Irish' Northern Irish signers argue against the use of the acronym NISL and believe that while their variety is distinct, it is still a part of British Sign Language."
the British Government recognises only British Sign Language and Irish Sign Language as the official sign languages used in Northern Ireland.