More details for history nerds:

As typography advanced, fleurons become more complex and intricate. Combinable ones got used to form borders and patterns. These designs became an art form unto themselves. Below is the title page of Christophe Plantin’s 1567 type specimen with a fleuron border.

So when you see fleurons scattered around the app, take a moment to appreciate the centuries of typographic tradition they represent. Or don’t!