alarm
alert
announce
announcement
audio
background
black
broadcast
broadcasting
bullhorn
communicate
communication
concept
control
design
element
equipment
flat
graphic
horn
icon
illustration
interface
isolated
loud
loudspeaker
media
megaphone
message
microphone
music
noise
object
propaganda
protest
public
scream
shout
sign
sound
speak
speaker
speech
symbol
voice
volume
warning
web
white