accident
advice
alarm
alert
alertness
attention
beware
black
button
careful
caution
communication
computer
danger
dangerous
design
element
error
exclamation
failure
hazard
icon
illustration
information
isolated
mark
message
nobody
orange
point
precaution
prevention
red
render
risk
road
safety
security
shiny
sign
stop
symbol
traffic
triangle
triangular
warn
warning
white
yellow