alarm
alert
attention
black
brake
button
caution
concept
design
error
exclamation
failed
filled
flat
glyph
graphic
hazard
icon
illustration
importance
important
indicator
information
isolated
logo
message
notification
occasion
payment
phone
pointer
priority
problem
risk
safety
security
sign
silhouette
solid
stencil
stop
style
symbol
telephone
threat
triangle
warning
web
zone