animal
background
barrel
business
chemical
container
damage
danger
drum
dump
energy
environment
environmental
forbidden
fuel
garbage
hazardous
industry
lizard
material
metal
nature
nuclear
objects
pollution
protection
radiation
radioactive
radium
render
risk
safety
science
security
shape
shiny
sign
steel
storage
substance
symbol
technology
threats
toxic
tun
uranium
vertical
warning
waste
yellow