Yūgen gaisha
A yūgen gaisha (有限会社, "limited company"), abbreviated in English as "Y.K." or "Co., Ltd.", was a form of business organization in Japan.Yūgen gaisha were based on the German Gesellschaft mit beschränkter Haftung and were implemented in Japan in the Limited Company Act (有限会社法, Yūgen gaisha hō) of 1940. The Companies Act of Japan, implemented on May 1, 2006, replaced the yūgen gaisha with a new form of company called gōdō gaisha, based upon the American limited liability company. Following the implementation, no new YKs were allowed in Japan, but pre-existing YKs were allowed to continue their operations as kabushiki gaisha under special rules.Whether the term is pronounced as yūgen gaisha or yūgen kaisha is up to the local dialect or the company's preference when it is part of the company's name. While it is pronounced yūgen gaisha in standard Japanese, the alphabetic abbreviation is always Y.K.