alert
area
atom
attention
background
banner
beware
caution
chemistry
danger
dangerous
design
energy
exclamation
fire
graphic
hazard
hazardous
icon
illustration
information
isolated
label
message
nuclear
pictogram
pollution
power
protection
radiation
radioactive
radioactivity
ray
reactor
risk
road
safety
security
set
sign
sticker
stop
symbol
toxic
triangle
warn
warning
yellow
zone