This is a QR Code. They are emerging as a convenient way to retrieve information from static advertising sites. You might have seen them in a magazine or in a bus shelter? All you need to do is scan them with a smartphone app and they can take you to a website or display other information. They are well suited to property vendors because they can be stuck to a ‘For Sale’ board and help people to navigate to an otherwise hard-to-remember website URL.
If you want one, you can make and print your own right here on this website. Go to www.baydesign.co.uk/qr-code-generator