advice
alert
area
attention
beware
cable
careful
caution
clear
close
current
danger
dangerous
electric
electrical
electricity
emblem
emergency
energy
exclamation
flash
forbidden
hazard
hazardous
high
industrial
information
keep
label
lightning
notice
panel
pictogram
power
precaution
protect
protection
risk
safety
security
shape
shock
signal
sticker
text
thunder
volt
voltage
warning
worry