abstract
alarm
alert
attention
background
ban
blank
caution
circle
collection
danger
design
empty
forbid
forbidden
glossy
graphic
hazard
icon
illustration
indication
information
isolated
mark
no
not
notice
pictogram
prevent
prohibited
prohibition
protection
red
restrict
restriction
risk
road
safety
set
sign
signal
stop
symbol
template
traffic
transport
transportation
warning
white