alert
attention
background
brown
careful
caution
corrosion
corrugated
danger
dangerous
design
distressed
electricity
emergency
energy
exclamation
grunge
hazard
high
icon
industry
lightning
line
metal
old
outside
point
power
protection
risk
rust
rusty
safety
shock
sign
signal
steel
stop
symbol
triangle
vintage
voltage exclamation
warning
yellow
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