accident
advice
advisory
alarm
alert
attention
beware
black
button
careful
caution
danger
endanger
error
excitement
exclamation
failed
failure
fatal
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glossy
gray
grey
hazard
icon
industry
information
interface
internet
mark
message
point
precaution
protection
risk
road
safety
secure
security
sign
site
stop
symbol
traffic
triangle
triangular
warn
web
white