The zipper-mouth face emoji depicts a face with zipped lips.
Unicode: U+1F910
The zipper-mouth face emoji represents silence, secrecy, or the inability to speak. It is commonly used to indicate that one is keeping a secret or refraining from revealing sensitive information. It can also convey a sense of discretion or being tight-lipped.
"My lips are sealed 🤐 – I won't tell anyone about the surprise party!"
"I can't discuss the details of the project, but 🤐 it's going to be amazing."