access
admission
admittance
allowed
arm
background
ban
caution
concept
danger
deny
design
direction
element
entrance
entry
error
forbid
forbidden
hand
hold
holding
human
icon
illustration
isolated
label
no
not
object
pictogram
prevent
prohibit
prohibited
prohibition
protest
protester
red
restricted
restriction
round
rule
sign
silhouette
sticker
stop
symbol
traffic
warning