alert
attention
autumn
background
beware
black
buried
cable
caution
closeup
danger
dangerous
daylight
dig
electric
electrical
electricity
energy
equipment
fall
fiber
forbidden
green
hazard
here
information
internet
label
metal
no
notice
optic
outdoor
outdoors
outside
power
protection
red
risk
safety
security
shape
sign
symbol
text
underground
vertical
warning
work
yellow