alarm
alert
background
caution
checking
connection
construction
control
danger
emergency
engineering
equipment
evacuation
extinguish
extinguisher
fighting
fire
fire extinguisher
firefighter
flame
hazard
hose
hydrant
industrial
industry
infrastructure
metal
object
pipe
pipeline
precaution
pressure
prevent
prevention
protection
pump
red
safe
safety
security
service
sign
sprinkler
symbol
system
tap
technology
valve
warning
water