Nikkei index

Etymology
Japanese, from 日経 (Nikkei), an abbreviation of 日本経済新聞 (Nihon Keizai Shimbun) (literally "Japan Economics Newspaper"), a Japanese newspaper which publishes the index.

Noun

 * 1)  A Japanese stock market index; normally refers to the Nikkei 225, which is calculated by aggregating the share prices of 225 large Japanese companies quoted on the Tokyo Stock Exchange, and thus reflects the performance of major Japanese businesses.