To sign a word containing letters, you would use a combination of hand shapes, movements, and facial expressions to represent the individual letters and form the word in sign language.
To sign the word "matrix," make a fist with your dominant hand and extend your index and middle fingers. Touch them to your forehead, then move them down in front…
To sign the word "preview," make a circular motion with your dominant hand while keeping your other hand stationary in front of you, as if showing something.
To sign the word "utility", make a fist with your dominant hand and place your thumb on your chin. Then, move your fist downwards in a small circular motion.
To sign the word "participation," use your dominant hand to make a "P" handshape and place it on your non-dominant palm, then move your dominant hand forward and up quickly.