explosion
boiler
building
caution
construction
danger
dangerous
death
door
electric
electrical
electricity
electrocution
energy
entry
flames
gas
gas safety
hazard
high
industrial
industry
information
keep
louvre
louvred
metal
plant
power
protection
risk
room
safe
safety
security
shock
sign
signage
signal
site
station
substation
symbol
triangle
voltage
warning
yellow