alert
attention
beware
black
caution
construction
crane
danger
dangerous
death
design
equipment
fall
falling
hazard
head
health
high
icon
illustration
indicator
industrial
industry
information
injury
isolated
job
label
man
notice
object
objects
obstacle
overhead
person
protect
protection
protective
risk
safety
security
sign
sticker
symbol
triangle
voltage
warning
work
yellow