This emoji shows a bento, actually a lunch box, and is divided into many different parts filled with vegetables, seafood like sushi, and portions of food. The box is most commonly used in Japanese culture.
Bento Box was approved for Unicode 6.0 in 2010 and included in Emoji 1.0 in 2015.
Bento Box emoji
🍱 Lunch Box
:bento: (Github, Slack)