alarm
alert
allowed
attention
ban
blank
caution
circle
communication
danger
design
disallowed
empty
entry
forbid
forbidden
graphic
hazard
icon
illegal
indication
information
mark
no
not
notice
pictogram
prevent
prohibit
prohibited
prohibition
protection
protest
red
restrict
restriction
restrictive
risk
road
safety
sign
signal
stop
symbol
template
traffic
transport
transportation
warning
wrong
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