I read a terrific book this summer called Teach Like a Champion by Doug Lemov.
I found that most of the techniques in the book, I do (to some degree). However, a few really caught my attention. These few I plan on working into my teaching practice. One of them is controlling the classroom environment through the use of seat signals.
During a teacher's instruction, it is incredibly distracting to both other students and the teacher if students leave their seat to take care of a basic need. Therefore, seat signals! Quick non-verbal signals that kids can use to ask my permission for basic things and I can give my assent through either a nod of my head or holding up my hand to signal "wait five minutes."
Here's what my seat signals look like (adapted from the book):
Any I'm forgetting?