TDK Corporation is a Japanese multinational electronics corporation that manufactures electronic components and recording and data-storage media. Its motto is "Contribute to culture and industry through creativity". "TDK" is an initialism of the original Japanese name of the company: Tokyo Denki Kagaku Kōgyō K.K. The company is listed on the Tokyo Stock Exchange and is a constituent of the Nikkei 225 and TOPIX indices. Wikipedia