CHN meaning in Regional ?

Chinook Jargon (Chinuk Wawa or Chinook Wawa, also known simply as Chinook or Jargon) is a language originating as a pidgin trade language in the Pacific Northwest, and spreading during the 19th century from the lower Columbia River, first to other areas in modern Oregon and Washington, then British Columbia and parts of Alaska, Northern California, Idaho and Montana while sometimes taking on 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 loanwords and those of other language systems. Its entire written form is in the Duployan shorthand developed by French priest Émile Duployé.

Many words from Chinook Jargon remain in common use in the Western United States and British Columbia today and it has been described as part of a multicultural heritage shared by the modern inhabitants of the Pacific Northwest. The total number of Jargon words in published lexicons numbered only in the hundreds, and so it was easy to learn. It has its own grammatical system, but a very simple one that, like its word list, was easy to learn. Though existent in Chinook Jargon, the consonant /r/ is rare, and English and French loan words, such as rice and merci, have changed in their adoption to the Jargon, to lays and mahsi, respectively.