barrel
caution
chemical
closeup
container
contamination
danger
disaster
disposal
drum
ecology
energy
environment
flammable
forbidden
gamma
garbage
hazard
hazardous
icon
illustration
industry
isolated
material
metal
nobody
nuclear
nuclear waste
poison
pollution
radiation
radioactive waste
radioactivity
safety
storage
substance
symbol
threat
toxic
trefoil
utilization
warning
yellow