Occupy movement hand signals

The Occupy movement hand signals are a group of hand signals used by Occupy movement protesters to negotiate a consensus. Hand signals are used instead of conventional audible signals, like applause, shouts, or booing, because they do not interrupt the speaker using the human microphone, a system where the front of the crowd repeats the speaker so that the content can be heard at the back of the crowd.

Source: Wikipedia — Occupy movement hand signals (CC BY-SA 4.0)