alert
attention
background
beware
black
button
caution
chemical
construction
danger
dangerous
environment
error
exclamation
explosive
flammable
harmful
hazard
icon
illustration
industrial
industry
information
isolated
label
mark
message
pictogram
point
poison
precaution
protection
radiation
risk
road
safety
secure
security
sign
stop
street
symbol
toxic
traffic
triangle
warn
warning
web
yellow