Beyond just meaning "smart," it can also symbolize abstract concepts like "mindset," "knowledge," or "psychology." You can also use it to express, "This problem is a real brain-teaser."

In Korea, it's recently used with internet slang like "noe-jeol" (overdoing something to the point of brain-freeze) or "noe-pisyel" ("brain-fficial," a personal theory with no evidence), adding a fun twist. As you can see, the brain emoji is used widely, from intellectual discussions to lighthearted jokes.