Quiet zone sign, black and yellow isolated silhouette

quiet zone sign black and yellow silence area warning notice peaceful calm noise control library study room hospital meditation concentration focus restricted noise level safety alert caution signage public area instruction environment sound control awareness no talking noise reduction designated area quiet space office zone classroom zone reading area focus area relaxation area work zone restricted sound zone concentration area silent zone meditation area calm zone alert sign safety measure information notice public warning quiet area zone signage noise control alert cautionary notice restricted talking area peaceful environment noise free area study area library quiet zone work area concentration space alert signage silent area calm environment noise awareness zone information sign public instruction safety alert quiet space indicator