alarm
alert
assembly
attention
beware
black
building
caution
construction
crowd
danger
elevator
emergency
entry
evacuation
exit
extinguisher
fire
hazard
health
hydrant
icon
industrial
lift
notice
point
prohibited
protection
pull
red
risk
rule
run
safe
safety
safety first
secure
security
sign
signboard
stairway
sticker
symbol
team
teamwork
warning
work
workplace
yellow
zone