While clapping is possible for any person who has two hands, as a expression of appreciation toward a deaf person who cannot hear, the sound produced is sort of pointless. You will see deaf people clap if they are expressing appreciation of a hearing person who can hear the sound of two hands hitting each other or if a deaf person is going along with a largely hearing audience. Deaf people and audiences often use their hands to show appreciation to performers or speakers but in an entirely soundless way. Follow me: raise both your hands to about shoulder level by bending your elbows, keeping them loosely by your sides. Fan your fingers out comfortably -- palm out. At this point you should be in a "surrender" position either standing or sitting. Now rotate your wrists back and forth to the left then right (or right then left, if you prefer). Continue rotating your wrists with fingers spread back and forth for as long as you want to express your appreciation to the speaker or performer. This gesture is sometimes referred to, in theatrical circles, as "jazz hands", though I'm not sure if the deaf community has a name for it.
Most users will sign Christmas by stroking the chin as though they have a beard. This can be used in conjunction with a hand clap (2 to 3 times) which indicated MERRY and then the beard sign being Christmas
A person who does sign language is called a "sign language interpreter" if they are interpreting between spoken language and sign language, or a "sign language user" if they communicate primarily through sign language.
To sign 'praise' in American Sign Language (ASL), place your dominant hand flat on your chest and move it upward in a circular motion. This movement signifies showing admiration or approval towards someone or something.
"Pakipaki" in Maori means "clap." It is often used as an instruction to applaud or to clap one's hands as a sign of appreciation or approval.
Anyone can learn sign language, but sign language is mostly associated with deaf and hard of hearing people which is their native language. (Although quite a few don't know sign language and learned language via oralism method.)