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Warchalking From Wikipedia, the free encyclopedia. Warchalking is a symbol language for sharing knowledge about an open wireless network. Inspired by hobo language, it was conceived by a group of friends in June 2002 and publicised by Matt Jones. Having found a node, the warchalker draws a special symbol on a nearby piece of public furniture - a wall, the pavement, the side of a lamppost. Anyone initiated in the ways of warchalking will recognise what it means, and get online. See also Wi-Fi. www.warchalking.org