accident
alarm
alert
attention
bell
beware
black
button
careful
caution
code
computer
cyber
danger
error
exclamation
flag
flat
hazard
icon
illustration
important
information
internet
line
mark
message
mistake
notice
notification
outline
point
precaution
problem
red
risk
safety
security
sign
signal
stop
symbol
traffic
triangle
warn
warning
web