Nikkei 225 is the major stock market index comprising of 225 highly liquid stocks of the Tokyo Stock Exchange (TSE).
For in depth information, see http://indexes.nikkei.co.jp/nkave/archives/faq/faq_nikkei_stock_average_en.pdf
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Release: Nikkei Indexes
Nikkei Industry Research Institute, Nikkei Stock Average, Nikkei 225© [NIKKEI225], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/NIKKEI225/, July 31, 2015.