Included are descriptive noise "levels":
"Noise Meter" header
0 - Silence: absolutely no talking
1 - Sneaky Spy: whisper - only 1 person can hear you
2 - Buzzing Bees: only your group can hear you
3 - Loud & Clear: everyone can hear you
4 - Sports Fans: outside voice - never used inside
You can paste and laminate these to chart paper or poster board and hung in the classroom. I used a clothespin and clipped it to the side of the Noise Level Chart to indicate our current noise level expectation.