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Taken from the movie, "WarGames", where the actor dialed many phone numbers looking for computers to access, called "War-Dialing". The analogy has been applied to wireless. War-walking, war-driving, war-flying refer to the modes of transportation for moving around and identifying various Access Points. Most reports of war-walking, war-driving, and war-flying have resulted in identifying large numbers of wide open unsecure Access Points in most areas.
War-chalking is the act of marking the area or vicinity with a symbol to infer that an AP is within range. WiFi War-chalking Symbols are at »searchmobilecomputing.techtarget···,00.html
Here's another FAQ with relevant info: /faq/wardrive