Nepenthe

Fanning slowly – “I am married.”

Fanning quickly – “I am engaged.”

Using as a fan – “Introduce me to your company.”

…?

I have to wonder who came up with this. One would imagine it was just some idea someone had and they published a whole etiquette book about it, and it slowly but forcefully caught on from there, because otherwise I can’t imagine this just being a thing that evolves spontaneously in a way everyone equally understands. Imagine sitting all the way across the room at a ball or something and witnessing someone break up with their boytoy through body language. With perfect clarity for all to see. You might as well just say it out loud.