alert
area
attention
beware
black
careful
caution
chemical
danger
dangerous
design
electric
electricity
energy
hazard
high
icon
illustration
industrial
information
ionizing
isolated
lab
label
laboratory
macro
medical
non
notice
nuclear
power
protection
radiation
radioactive
risk
safety
security
sign
signage
signal
spectrum
sticker
symbol
technology
triangle
voltage
warning
yellow
zone