abstract
alarm
alert
attention
background
beware
bubble
button
caution
circle
danger
design
error
exclamation
flat
graphic
hazard
help
icon
illustration
important
information
internet
isolated
label
mark
message
modern
notice
pictogram
point
problem
red
risk
safety
secure
security
shape
sign
signal
silhouette
stop
symbol
traffic
trouble
warn
warning
web
website
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