accident
barell
barrel
bio
biohazard
biological
biology
can
canister
caution
chemical
container
danger
disaster
drum
dump
ecology
environment
flank
forbidden
freight
garbage
green
hazard
industry
isolated
lethal
material
metal
poison
pollution
pour
pouring
protect
puddle
risk
safety
spilling
storage
substance
symbol
threat
toxic
toxin
utilization
virus
warn
warning
waste
yellow