access
area
attention
authorized
background
beware
caution
closed
conditioner
confine
confined
confined space sign
construction
danger
death
do not enter
enter
entry
environment
equipment
flow
gas
hazard
health
hole
icon
illustration
industrial
industry
inhale
label
manhole
only
permit
permit only
protection
red
restriction
risk
safety
security
set
sign
space
sticker
symbol
ventilation
warning
zone