英文關鍵字
alarm
area
arrow
attention
black
caution
collection
danger
dangerous
door
electric
electrical
electricity
energy
extreme
forbidden
grey
hazard
hazardous
high
icon
illustration
industrial
industry
isolated
lab
label
laboratory
lighting
notice
power
protect
protection
public
risk
safety
security
shock
sign
signal
stock
symbol
triangle
triangular
utility
voltage
warn
white
yellow
zone