This emoji was actually created based on the Japanese rice cracker 'senbei.' However, because its appearance of a round rice ball wrapped in seaweed is similar to a Korean jumeokbap, many Koreans think of it and use it as a rice ball emoji.

In Korean culture, rice balls are a staple for picnic lunch boxes and represent a simple yet filling meal for a busy day. That's why they are also used metaphorically to cheer someone on or convey warm feelings. It's a great example of how a single emoji can take on rich meanings depending on the culture.