Oh, dude, that's like the sign for "applause" in sign language. So, if you see someone doing that, they're either really impressed with something or they're just trying to make some noise without clapping. It's like giving a round of silent applause, you know?
The sign language for "restaurant" involves forming the letter "R" with your dominant hand and tapping it twice on the back of your non-dominant hand.
The sign for "new" in American Sign Language (ASL) is made by taking your dominant hand in a "Y" handshape and tapping it twice on the back of your non-dominant hand.
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In American Sign Language, you sign "veteran" by extending the index and middle fingers of one hand and tapping them against the other forearm.
In American Sign Language, the sign for "crazy" or "loco" involves forming the letter "C" with your dominant hand and tapping your temple twice.
The sign language for "restaurant" involves forming the letter "R" with your dominant hand and tapping it twice on the back of your non-dominant hand.
The sign for "new" in American Sign Language (ASL) is made by taking your dominant hand in a "Y" handshape and tapping it twice on the back of your non-dominant hand.
The sign language for "potty" involves forming the letter "T" with your dominant hand and tapping it on your non-dominant hand.
See related link. According to that same site, registration is REGISTER + RECORD
In American Sign Language, you sign "veteran" by extending the index and middle fingers of one hand and tapping them against the other forearm.
In American Sign Language, the sign for "crazy" or "loco" involves forming the letter "C" with your dominant hand and tapping your temple twice.
To sign "handsome man" in American Sign Language, you would sign "handsome" by brushing your flat hand against your chin and then sign "man" by tapping your forehead with a flat hand.
In American Sign Language (ASL), the sign for "on purpose" involves tapping your chest with the fingertips of your dominant hand twice, then bringing your hand forward with intention.
In American Sign Language, you can sign "afternoon" by combining the signs for "after" and "noon." Start by signing "after" by moving your dominant hand in a backward motion, then sign "noon" by tapping your wrist with the hand in an upward motion.
In American Sign Language, the sign for "blood" involves making a fist with your dominant hand and tapping the side of your chest near your heart twice.
In American Sign Language, the name "Erin" can be signed by making an "E" handshape with your dominant hand and tapping it on your non-dominant palm.
In American Sign Language (ASL), the sign for coffee is made by forming the letter C with one hand and tapping it against the side of the cheek.