How to Sign "Master"
To sign "master" (in the sense of having deep experience or being a seasoned expert), start with your dominant hand in an open, curved "5" handshape (a claw shape) resting against your cheek and jawline. Pull your hand outward and slightly down away from your face, bringing your fingers and thumb together to close into a "flat O" or "S" handshape. Note that this is also the standard sign for "experience".