This emoji is the No One Under Eighteen symbol, which is used to indicate that something is not suitable for people under the age of 18. Read more
It is a popular emoji, especially among teens and young adults. It is most commonly used on social media platforms such as Twitter, Instagram, and Snapchat. This emoji is not considered rude, but rather a warning to those who may not be old enough to view the content.
The No One Under Eighteen symbol has been around since the early 2000s, when it was first used to indicate that certain websites or content were not suitable for minors. It has since become a popular emoji to indicate the same, and is used to warn people that the content they are about to view may be inappropriate for those under the age of 18. It is also used to warn parents that the content their children are viewing may not be suitable for their age.