alarm
alert
building
case
caution
danger
direction
do
door
doorway
elevator
emergency
escape
evacuation
exit
fire
flame
hazard
health
help
icon
illustration
information
isolated
label
lift
no
not
notice
office
people
protection
red
rescue
risk
run
safe
safety
security
sign
signal
stairs
stairway
stop
symbol
urgency
use
warning
way