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Symbol Encyclopedia
"Contains more than 2,500 Western signs, arranged into 54 groups according to their graphic characteristics. In 1,600 articles their histories, uses, and meanings are thoroughly discussed. The signs range from ideograms carved in mammoth teeth by Cro-Magnon men, to hobo signs and subway graffiti."
posted to reference by Brad, Nov 26th, 2002
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I had heard about hobos putting a symbol outside of people's houses who were "hobo-friendly" and now I have confirmation.