accident
alarm
alert
bell
carbon
co
co2
danger
design
detection
detector
device
dioxide
element
emergency
equipment
evacuation
fire
flame
graphic
icon
illustration
ionization
isolated
monoxide
object
optical
photoelectric
plastic
prevention
protect
protection
rescue
ring
safe
safety
secure
security
sensitivity
sensor
shadow
signal
siren
smoke
sound
system
technology
urgency
vector
warn
warning