How to Sign "Nonverbal"
To sign nonverbal, form a 'U' handshape with your dominant hand by extending your index and middle fingers and keeping them together. Bring your fingertips up to your chin or lower mouth area, and move the hand slightly outward. Crucially, you must shake your head 'no' and use a slightly furrowed, negative facial expression while making this hand motion. This combination of the sign for speech or voice with a negative headshake clearly indicates the absence of spoken language.