atom
atomic
background
barrel
business
caution
chemical
container
contaminated
contamination
danger
disaster
disposal
drum
ecology
energy
environment
fuel
gallon
garbage
geometric
hazard
hazardous
icon
illustration
industrial
industry
isolated
material
metal
nuclear
object
oil
pattern
poison
pollution
power
radiation
radioactive
radioactivity
repeat
repeating
safety
seamless
sign
simple
storage
substance
symbol
texture
toxic
uranium
wallpaper
waste
white