This emoji is a symbol for radioactivity, and is often used to indicate a hazardous or dangerous situation. Read more
It is not particularly popular or widely used, and is most likely to be used by older age groups. It is not commonly used on social media platforms, but is often used in text messages and emails.
No, this is not a rude emoji. It was first introduced in the Unicode 6.0 in 2010, and is part of the Miscellaneous Symbols and Pictographs block. It was created to represent the concept of radioactivity, and is often used to indicate a hazardous or dangerous situation. It is also sometimes used to represent nuclear energy, nuclear power plants, or nuclear weapons. It is sometimes used in a humorous way to indicate something that is toxic or dangerous, such as a toxic relationship or a bad habit.