Beyond its original meaning of marking a location, this emoji is often used to represent the idiomatic expression 'red flag,' signifying a warning sign in a relationship or situation.

For example, it's used when a friend complains about their partner, asking, 'Isn't that a huge red flag?' Thus, its meaning has expanded to a negative connotation, focusing on the color (red = warning) to imply a problem. Of course, it's still often used positively to emphasize a location, like sending a map with 'Let's meet here!'