[aisofteng]

I find mechanisms like this to be silly and childish. We're all adults; part of life is learning how to communicate and how to be heard - more generally, how to function in a group. If you haven't figured out how to function properly to the point that you need a system of hand signals in meetings, then it is worth it to look at why your development has been stunted, perhaps with a therapist.

Similarly to that other commenter who didn't give a reason, I would also immediately start looking for work if my workplace implemented this.