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Expression (sign language)
Signs with two different expressions. The pursed lips and partly closed eyes on the left, and raised lip on the right, are necessary for proper formation of the signs.
In sign languages, expressions are the distinctive body postures and facial expressions that accompany signing, and which are necessary to properly form words. Expression is one of five components of a sign, along with handshape (DEZ), orientation (ORI), location (TAB), and movement (SIG). A major component of expression is mouthing. However, not all signs have an inherent expression.
^a Sign-language names reflect the region of origin. Natural sign languages are not related to the spoken language used in the same region. For example, French Sign Language originated in France, but is not related to French. Conversely, ASL and BSL both originated in English-speaking countries but are not related to each other; ASL however is related to French Sign Language.
^b Denotes the number (if known) of languages within the family. No further information is given on these languages.