background
beware
buried
business
cable
cables
call
caution
communication
construction
danger
design
dig
electric
electrical
electricity
energy
equipment
fiber
forbidden
green
hazard
industrial
industry
information
internet
line
marker
metal
notice
optic
optical
orange
outdoor
outside
post
power
red
risk
road
safety
sign
symbol
telecommunications
telephone
under
underground
warning
wire
work