The Duployan shorthand, or Duployan stenography, was created by Father Émile Duployé in 1860 for writing French. Since then, it has been expanded and adapted for writing English, German, Spanish, Romanian, Latin, Danish, and Chinook Jargon. The Duployan stenography is classified as a geometric, alphabetic stenography and is written left-to-right in connected stenographic style. The Duployan shorthands, including Chinook writing, Pernin's Universal Phonography, Perrault's English Shorthand, the Sloan-Duployan Modern Shorthand, and Romanian stenography, were included as a single script in version 7.0 of the Unicode Standard / ISO 10646

Chinook Jargon is a language originating as a pidgin trade language in the Pacific Northwest. It spread during the 19th century from the lower Columbia River, first to other areas in modern Oregon and Washington, then to British Columbia and parts of Alaska, Northern California, Idaho and Montana, sometimes taking on the characteristics of a creole language. It is partly descended from the Chinook language, upon which much of its vocabulary is based. Approximately 15 percent of its lexicon is French, and it also makes use of English loan words and those of other language systems. Its entire written form is in the Duployan shorthand developed by French priest Émile Duployé.