alert
atom
attention
beware
biohazard
biological
black
caution
chemical
danger
ecology
element
glossy
gold
golden
hazard
hazardous
icon
illustration
isolated
isotope
label
mark
metallic
nuclear
nuke
poisonous
power
problems
protection
radiation
radioactive
radioactivity
radioisotope
recycling
red
restricted
risk
safety
set
sign
substance
symbol
technology
toxic
triangle
warning
waste
yellow