Are These Symbols Part of a Burglars' Code? | Snopes.com
Suspicious chalk markings spark burglary fears on Portland - but turn out to be made by a running club | Dorset Echo
Keytek Locksmiths Blog - House Robbery Markings
Burglar Symbols chalked on houses in Spain. Innocent looking bit of graffiti or unobtrusive marking on a wall or pave… | Hobo signs, Steel signs, Livestock branding
Revealed: This is what those burglar signs outside homes REALLY mean - Birmingham Live
Keytek Locksmiths Blog - House Robbery Markings
Swale police come clean over mysterious markings outside your house
Da Pinchi Code': Kidlington mystery 'burglar' marks left by running club - BBC News