War Chalking<p>War chalking is marking areas, usually on sidewalks with chalk, that receive wireless signals to advertise an open Wi-Fi network. War chalking was inspired by hobo symbols and were conceived by a group of friends in June 2002. They were publicised by Matt Jones who designed the set of icons and produced a downloadable document containing them.</p> <p>See also: <a href="https://en.wikipedia.org/wiki/Warchalking">War Chalking</a></p> <p> </p>