The Mitsubishi Group is a group of autonomous Japanese multinational companies in a variety of industries.
Founded by Yatarō Iwasaki in 1870, the Mitsubishi Group historically descended from the Mitsubishi zaibatsu, a unified company which existed from 1870 to 1946. The company was disbanded during the occupation of Japan following World War II. The former constituents of the company continue to share the Mitsubishi brand and trademark. Although the group of companies participate in limited business cooperation, most famously through monthly "Friday Conference" executive meetings, they are formally independent and are not under common control. The four main companies in the group are MUFG Bank (the largest bank in Japan), Mitsubishi Corporation (a general trading company), Mitsubishi Electric and Mitsubishi Heavy Industries (both diversified manufacturing companies).
The Mitsubishi company was established as a shipping firm by Iwasaki Yatarō (1834–1885) in 1870 under the name "Tsukumo Shokai". In 1873, its name was changed to Mitsubishi Shokai; Mitsubishi consists of two parts: "mitsu" (三) meaning "three" (as in the three oak leaves from the crest of the Yamauchi or Tosa family that ruled over Yatarō's birthplace and employed him) and "hishi" (菱, which becomes "bishi" under rendaku) meaning "water caltrop", and hence "rhombus", which is reflected in the company's logo. It is also translated as "three diamonds".
Mitsubishi was established in 1870, two years after the Meiji Restoration, with shipping as its core business. Its diversification was mostly into related fields. It entered into coal-mining to gain the coal needed for ships, bought a shipbuilding yard from the government to repair the ships it used, founded an iron mill to supply iron to the shipbuilding yard, started a marine insurance business to cater for its shipping business, and so forth. Later, the managerial resources and technological capabilities acquired through the operation of shipbuilding were used to expand the business further into the manufacture of aircraft and equipment.