explosion
atomic
barrel
biohazard
black
business
caution
chemical
closeup
container
contamination
danger
design
disaster
disposal
drum
ecology
energy
environment
factory
flammable
forbidden
garbage
hazard
hazardous
icon
industry
isolated
line
logo
metal
nuclear
outline
poison
pollution
power
radiation
radioactive
skull
substance
symbol
technology
thin
threat
toxic
trefoil
war
warning
waste