What does em0 mean?

Emo space refers to a rock style, the full name of which is emotional hardcore, and it is a subclass of punk music. Later, the word generally refers to emotion, which can be understood as "unhappy" and "depressed".

The music type of "emo" originated in the late 20th century, and translated as "emotional rock" or "emotional hard core", which is a subclass of hard-core punk music. Many bands belong to this style.

Today, the scope of being classified as an emotional core band is wider, which makes the word "emo" a very broad musical style term, rather than being used to refer to a certain kind of music.