The Cant (PWH)

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The cant is a sort of planar slang. It's used mainly in Sigil, and primarily by the lower and middle classes. A few words have invaded all levels of society, but heavy cant usage is a mark of low standing and poor graces. Thus, while it may be quite common to hear rogues and mercenaries and even merchants in Sigil using the unique slang, few use it on Mount Celestia or Baator, particularly those of more refined sophistication. 
Besides, the cant is ever-changing, as real cultures and their idioms change. Various cant alterations can be found in different areas and different social groups. Each group creates new words and phrases as others fall out of use. For example, none of the trendy Sigil youths even use "berk" anymore. 
See page 150 for the updated planar glossary.