Warchalking is a symbol language to share knowledge about an open wireless network.
It was conceived by Matt Jone in June 2002.
Given 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 knowing in the ways of the WarChalking will recognise what it means, and get online.
See also Wi-Fi.
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