ban
banner
barbed
barrier
blue
board
danger
fence
firing
forbad
forbade
forbidden
gaol
ground
guide
inscription
interdiction
jail
military
nobody
notice
notification
obstacle
ordnance
outdoor
outdoors
plate
prison
prohibit
prohibition
protection
range
safeguarding
safety
sign
signboard
sky
target
territory
war
warning
wire
yard
zone