accident
alarm
alert
attention
background
banner
beware
black
button
careful
caution
computer
construction
danger
dangerous
design
error
exclamation
graphic
hazard
icon
illustration
important
information
isolated
label
mark
message
problem
protection
red
risk
road
safety
secure
security
set
sign
signal
site
stop
symbol
traffic
triangle
warn
warning
web
white
yellow