This article examines the history and meaning of the abbreviation "JP", which is commonly used to refer to Japan or Japanese people. It is derived from the initials of two words: “Japan” and “People”, and it has been used since at least 1901. In Japan itself, however, it stands for 'Joint Professionalism' or 'Joint Professionals', referring to professional organizations owned by multiple companies or individuals. Other meanings associated with JP include 'Just Playin', 'Job Performance', and 'Jury Panel'. Misconceptions about the acronym include thinking that it stands for 'Japan Post', when in fact it does not have anything to do with postal services.