Nonmanual feature

A nonmanual feature, also sometimes called nonmanual signal or sign language expression, are the features of signed languages that do not use the hands. Nonmanual features are grammaticised and a necessary component in many signs, in the same way that manual features are. Nonmanual features serve a similar function to intonation in spoken languages.[1]

A signer furrowing their eyebrows and pursing their lips, as well as making a manual claw shape in front of their face
ASL sign for "angry"—note the furrowed eyebrows
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