accident
alarm
alert
area
attention
background
beware
black
careful
caution
construction
danger
dangerous
design
electric
electrical
equipment
finger
graphic
hand
hazard
high
icon
illustration
industrial
industry
information
isolated
label
notice
precaution
protect
protection
risk
safe
safety
secure
security
shock
sign
signboard
skull
sticker
symbol
triangle
voltage
warning
white
zone