Before sexting, before coded bracelets, there were…stamps? Rio Wang has written a fascinating piece about how the angle that stamps were placed on the envelope conveys different meanings. According to the OP, the tradition began with the Austro-Hungarians in the 1860’s and swiftly spread throughout Europe.

Read more: http://theoncominghope.blogspot.com/2011/12/secret-language-of-postage-stamps.html#ixzz1hqY8oSCO