機器
alarm
alert
area
beware
biohazard
black
careful
caution
construction
corrosive
danger
dangerous
explosive
fire
hazard
high
hot
industrial
industry
irritant
keep
moving
not
place
pressure
prohibition
protection
radiation
red
restricted
restriction
risk
rotating
safe
secure
security
shock
signboard
skull
stage
symbol
temperature
toxic
typicalsign
voltage
wave
xray
zone