They came to our school today, they applause by raising up their arms and rotating their wrists(like how you rotate your wrists to signal that you dont have something that someone is looking for)I didnt know that until today.
Yeap. Cos sign language is very "visual" , so the motions have to be pretty big.
Yup, they can't hear, so don't need to applause. Rather, movements are used to show that you are clapping for them.