The Duployan block contains characters used in the Duployan shorthand system, which was invented in the 19th century by Émile Duployé. This shorthand system was widely used in various languages, including French, English, and Chinook Jargon, for quickly transcribing speech. The Duployan script is highly systematic, with characters representing syllables and common phrases. This block includes all the necessary characters for writing in Duployan shorthand, reflecting its historical importance in stenography and rapid transcription..