alert
attention
background
banner
block
caution
communication
concept
danger
danger sign
dangerous
design
do not enter
grunge
hazard
hazardous
illustration
incomplete
information graphics
keep away
keep out
mark
message
miscellaneous
no people
notice board
object
red background
risk
safety
safety icon
security
sign
sign board
signboard
simple
stamp
stay away
stonewall
stop
symbol
table
text
top view
warning
white
white letters
wooden
word
wording