access
addicted
allowed
anti
attention
background
ban
blank
caution
circle
danger
denied
design
disallowed
dont
empty
entry
flat
forbid
forbidden
icon
illegal
illustration
indication
information
isolated
law
mark
no
prohibit
prohibited
prohibition
red
restrict
restriction
risk
road
rule
safety
sign
signal
stop
symbol
traffic
transparent
transportation
warning
white
wrong