abortion
abstract
alcohol
alert
background
black
blackboard
break
business
cancel
caution
chalkboard
closed
communication
computer
concept
connection
control
cut
danger
discontinuation
do
down
end
exit
finish
hand
human
illustration
internet
life
message
no
off
offline
pause
problem
safety
screen
security
serious
sign
smoking
stop
symbol
technology
terminate
termination
text
touchscreen
violence
warning
word