The logo of three red diamonds, shared with over forty other companies within the keiretsu, predates Mitsubishi Motors itself by almost a century. It was chosen by Iwasaki Yatarō, the founder of Mitsubishi, as it was suggestive of the emblem of the Tosa Clan who first employed him, and because his own family crest was three rhombuses stacked atop each other. The name Mitsubishi (三菱) consists of two parts: "mitsu" meaning "three" and "hishi" (which becomes "bishi" under rendaku) meaning "water caltrop" (also called "water chestnut"), and hence "rhombus", which is reflected in the company's logo.[14]