area
atom
background
close
danger
do
electric
electromagnetic
environment
equipment
fire
frequency
hazard
health
heat
high
hot
icon
industrial
ionizing
label
lowfrequency
medical
microwave
nonionizing
nuclear
oven
pacemakers
pictogram
plutonium
pollution
protection
radiation
radio
radioactivity
ray
restricted
risk
risky
safety
security
sign
spectrum
sticker
symbol
technology
uranium
wave
zone