American Sign Language: Yes/No Facial expression.
You should raise your eyebrows when asking a question to which there is a "yes" or "no" answer.
YES/NO facial expression:
Note: The "Yes/No" facial expression is one of many "nonmanual markers" (NMM) used in ASL.
For more information, see: Nonmanual Markers (NNM)
Also see: "WH question facial expression"
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