How to Sign "Nail"
To sign 'nail' (as in the metal hardware), hold your non-dominant hand out in front of you, either flat with the palm facing down or in a loose fist, to represent a surface. Form your dominant hand into an 'S' shape (a fist) to represent a hammer. Bring your dominant fist down to strike the back of your non-dominant hand, mimicking the action of hammering a nail into wood.