Placard

A handheld protest sign: a board on a stick. On most phones the board is blank or carries a scribble, so the emoji stands for the act of holding up a sign rather than any particular slogan. It is the emoji equivalent of a picket sign at a strike or a placard at a demonstration.

People reach for it when they are talking about protests, strikes, marches, petitions, elections and activism of every kind: "see you at the rally 🪧", "union meeting Friday 🪧". It also serves for literal signs of other sorts, such as a "for sale" board, a shop notice or a directional sign, and for announcements generally, because a sign is simply a message held up for everyone to see.

What does it mean when someone sends 🪧?

They are putting their words on a sign for you. Next to a political or social statement it says "I stand behind this": protest, solidarity, or a call to join. Next to something trivial ("bring back the old menu 🪧") it is a joke, turning a small gripe into a one-person demonstration. Next to a date, a price or a reminder it is just a notice board: "look here".

On its own, with no words, it is ambiguous. Many readers think of protest or activism first, so if you only mean "announcement", say so in the message. If someone sends it after news of a strike or a march, it usually reads as support, and the words around it tell you whether they're going too.