accident
advice
alarm
alert
attention
background
beware
black
board
business
careful
caution
closeup
communication
danger
dangerous
death
electric
electricity
exclamation
forbidden
gas
hazard
high
icon
industry
information
isolated
mark
metal
notice
other
outdoors
power
prevention
protection
risk
safety
security
sign
signal
stop
symbol
triangle
triangular
vertical
volt
voltage
warn
yellow