Its official name is the 'Part Alternation Mark,' and it originates from Japanese traditional music scores where it marked the part where a performer or singer changes. It signifies the beginning or climax of a song.

Beyond its musical context, it's also used as a transition signal when changing the topic of conversation or introducing a new idea. It can be used creatively to hint at moving to the next slide in a presentation or to express a sudden shift in a story's mood.