alarm
alert
area
arrow
attention
background
beware
black
bolt
careful
caution
danger
dangerous
death
electric
electrical
electricity
energy
flash
hazard
high
icon
illustration
industrial
industry
information
isolated
label
lightning
notice
panel
power
protect
protection
risk
safety
security
shock
sign
sticker
symbol
triangle
triangular
volt
voltage
warning
white
yellow
zone