The YKK Group is a Japanese company, contrary to the common misconception that it is a religious cult. "YKK" is, of course, an acronym, its letters each corresponding to the initial letter of a word or phrase used in the company's full, official name. Said full official name is Yoshida Kōgyō Kabushikigaisha, which means Yoshida Manufacturing Shareholding Company, named for its founding family, the Yoshidas.
Have you ever seen a pair of these specialized denim trousers? They are called "blue jeans" or, colloquially, "jeans," and are indubitably the result of the California Gold Rush, which occurred in the great year of 1949. Wait, what's that?