abstain
allowed
anti
attention
background
ban
blank
caution
circle
danger
disallowed
entry
forbid
forbidden
graphic
icon
illegal
illustration
indication
information
isolated
law
line
mark
no
notice
object
prevent
prohibit
prohibited
prohibition
red
reflection
restrict
restriction
risk
road
rule
safety
shiny
sign
stop
symbol
template
traffic
transportation
warning
white
wrong