accident
advice
advisory
alarm
alert
attention
beware
careful
caution
construction
damage
danger
dangerous
electric
endanger
error
excitement
exclaim
exclamation
failure
fatal
forbidden
halt
hazard
hazardous
icon
illustration
industrial
information
interface
mark
pictogram
precaution
prevent
prevention
protect
protection
risk
safety
secure
security
sign
stop
symbol
triangle
voltage
warn