Ключевые слова: 10, access denial, announcement, audio, audio ban, ban, black, circle, clear, communication, design, equipment, event, forbidden, graphic, icon, information, instruction, media, microphone, mute, no, no announcement, no noise, no speaking, not allowed, policy, presentation, prohibition, public, quiet, recording, red, restriction, sign, silence, silence zone, silent mode, sound, speech, stop, symbol, technology, visual, vocal, vocal prohibition,