機器
alarm
alert
ambulance
attack
attention
backdrop
background
bad
beacon
black
bulb
button
caution
code
control
danger
electric
emergency
equipment
factory
fire
flasher
flashing
glowing
illustration
indicator
industrial
industry
isolated
lamp
led
light
panel
police
power
red
safety
security
sign
signal
siren
status
switch
system
technology
urgency
warning
white
zone