alert
barrel
beam
beware
board
cancer
caution
chemical
collection
danger
dangerous
do
do not enter
electrical
element
enter
fire
flame
flammable
forbidden
hair
headwear
human
icon
ignite
laser
light
lightning
mandatory
no
no smoking
not
poison
prohibited
prohibition
protect
protection
protective
risk
safety
security
set
skull
smoking
stop
storage
symbol
warning
web
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