1. Sign for "Quiet": You can use the sign for "quiet" (which looks like you're putting your index finger to your lips) and then use a facial expression to emphasize the request.
2. Sign for "Shh": You can also use the sign for "shh" (which involves bringing your hand to your mouth and then moving it slightly outward) with the same facial expression.
3. Facial Expression: The key to getting your message across is the facial expression. You'll want to use a furrowed brow, pursed lips, and a pointed look in the direction of the person you want to be quiet.
Example:
* You could sign "Quiet" (index finger to lips) with a serious facial expression.
* You could sign "Shh" (hand to mouth) and then make a "shhh" sound with your lips.
It's important to note that the specific signs and expressions used can vary depending on the context and the individual signing. However, the basic idea is to use a combination of signs and facial expressions to clearly convey the message "be quiet."