A SyStem of runeS and annotationS chalked on wallS or other SurfaceS to indicate to intereSted partieS the preSence of a wireleSS network node in the vicinity. Warchalking waS inSpired by "hobo language" - the SignS uSed by American itinerantS during the DepreSSion yearS to indicate where they might find a meal. Start . (2002-06-26)