The DAX (Deutscher Aktienindex (German stock index); German pronunciation: [daks] ) is a stock market index consisting of the 40 major German blue chip companies trading on the Frankfurt Stock Exchange. It is a total return index. Prices are taken from the Xetra trading venue. According to Deutsche Börse, the operator of Xetra, DAX measures the performance of the Prime Standard's 40 largest German companies in terms of order book volume and market capitalization.
https://en.wikipedia.org/wiki/DAX