abstract
alert
arrow
art
battery
black
blitz
bolt
cartoon
charge
circle
danger
design
electric
electricity
energy
fast
flash
flat
graphic
hazard
high
icon
illustration
isolated
light
lightening
lightning
logo
power
risk
safety
shape
shock
sign
signal
speed
storm
symbol
threat
thunder
thunderbolt
triangle
volt
voltage
warning
white
yellow
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