The metro emoji symbolizes urban public transportation and represents the busy life of a city dweller. It's commonly used when you're on the move, running late for an appointment, or talking about city life.

The design varies slightly by platform, like the London Tube or the New York City Subway. In K-culture, the subway often appears in dramas and webtoons as a place where characters have chance encounters or experience the joys and sorrows of daily life. So, this emoji is sometimes used to convey that cultural context.