allowed
app
application
audio
background
button
caution
circle
conference
disturb
forbidden
graphic
icon
illustration
isolated
label
laptop
loud
loudspeaker
music
mute
no
noise
noisy
off
phone
player
prohibited
prohibition
quiet
radio
record
red
sign
silence
sound
speak
speaker
stereo
stop
symbol
talking
traffic
voice
volume
warning
white