access
alert
allowed
area
attention
background
barrier
board
business
caution
control
danger
dangerous
denied
design
do
enter
entrance
entry
fence
forbidden
hazard
information
label
message
metal
no
not
object
outdoors
pass
permission
permit
precaution
prohibited
prohibition
protection
red
restricted
restriction
risk
safety
security
sign
stop
symbol
text
warning
white
zone