alert
amplifier
announce
announcement
audio
cartoon
character
communication
cop
cute
electronic
guard
gun
handcuffs
horn
icon
illustration
investigation
job
justice
kawaii
law
loud
loudspeaker
mascot
message
noise
officer
patrol
police
policeman
prison
profession
professional
protection
safety
security
simple
sound
speaker
speech
stereo
sticker
symbol
system
technology
traffic
uniform
volume
warning