alert
atom
atomic
background
badge
banner
blue
bright
caution
danger
decoration
design
deterrent
disaster
electric
energy
glow
hazard
hazardous
icon
illuminated
illustration
irradiation
light
neon
night
nuclear
pictogram
plutonium
pollutant
pollution
power
radiation
radioactive
radioactivity
ray
reactor
research
roentgen
safety
science
shape
sign
simple
style
symbol
uranium
warn
warning
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