公こう開かい書しょ簡かんMeaningsNoun1. open letterKanji used公public開open書write簡simpleComposed of公こう開かいopening to the public; making available to the public; exhibiting; unveiling; release (of a film, information, etc.); disclosure; publicationNoun書しょ簡かんletter; note; epistle; correspondenceNoun