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"Mysterious chalk symbols have appeared almost overnight in London, believed to be created by a gang of nerds set on revealing the city's wireless hot spots.
"Warchalking", as it is known, derives from the practice of tramps in 1930s depression-hit America leaving chalk messages to each other to indicate where they could get food and shelter.
Today, the set of symbols tells other geeks, or "Wibos" as they are known, where they can get a free wireless internet connection.
Symbols written on the pavement indicate whether the wireless network is open, closed or encrypted. Above the symbol is the network's Service Set ID (SSID), which is used to identify the particular wireless Lan to be accessed. Below the symbol is the amount of bandwidth on offer."