It's used not only for protests and rallies conveying social messages but also by fans cheering for stars at sports games or concerts. It's the right emoji when you want to actively express your opinion.

In K-pop culture especially, fans holding up handmade placards to support their idols is a major part of the fan culture. As such, this emoji is a useful tool for expressing a wide range of sentiments, from serious social resistance to everyday complaints like "I hate Mondays!"