accident
alarm
alert
art
attention
battery
brake
button
charge
collision
color
concept
design
discharge
element
ends
error
flat
forced stop
graphic
hazard
icon
illustration
importance
important
indicator
information
line
message
notification
occasion
phone
pointer
priority
risk
safety
security
sign
stencil
stop
symbol
telephone
threat
triangle
ui
warning
web
zone