explosion
alert
attention
biological
bomb
caution
chemical
collection
danger
dangerous
death
electrical
environment
error
falling
flammable
graphic
hazard
hot
icon
illustration
isolated
label
laser
logistic
message
notice
precaution
radiation
radioactive
risk
safety
security
set
shock
sign
siren
solid
stop
stumble
surface
symbol
toxic
triangle
virus
voltage
warn
warning
white