accident
alarm
alert
attention
background
call
care
check
clipboard
control
danger
detector
electrician
electronic
emergency
engineer
equipment
evacuate
examine
fire
hand
indoors
inspector
male
man
modern
office
person
point
precaution
press
prevention
protection
rescue
risk
safety
security
service
set
signal
siren
smoke
sound
technology
test
threat
wall
warning
worker
young