This is how you sign Understood in American Sign Language.

How to sign

To sign "Understood" in American Sign Language (ASL), wave your dominant palm downward. Form your dominant hand into a '1' handshape (index finger pointing up). Then, nod your head.

To sign "Understood" in American Sign Language (ASL), start with your dominant hand facing down. Move it downward, then flick your index finger upward into a '1' handshape while nodding your head.