At Crisp we often find ourselves discussing various, sometimes though topics, in really big groups. The way we govern ourselves (no managers) and the fact that we make big decisions by consensus or concent have driven a need for us to figure out how to have efficient and effective discussions in big groups. A couple of hand signals have emerged over time that works as a great communication/collaboration tool for us when voting and discussing.
You can download a PDF with all the hand signals here.
Once downloaded you can, if you want to, print them on A4 or A3 papers and use them yourself.