That's not odd at all--most countries have their own sign language, even ones that speak
the same verbal language.
Quote:
Although the United Kingdom and the United States share English as the predominant oral language, British Sign Language is quite distinct from American Sign Language (ASL) - having only 31% signs identical, or 44% cognate.[9] BSL is also distinct from Irish Sign Language (ISL) (ISG in the ISO system) which is more closely related to French Sign Language (LSF) and ASL.
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