The Jonathan Coulton song Mandelbrot Set is a tribute to both the fractal itself and to its father Benoit Mandelbrot. The second book of the Mode series by Piers Anthony, Fractal Mode, describes a world that is a perfect 3D model of the set.
Bloomberg Dollar Spot Index. The Bloomberg Dollar Spot Index (BBDXY) tracks the performance of a basket of 10 leading global currencies versus the U.S. Dollar. It has a dynamically updated composition and represents a diverse set of currencies that are important from trade and liquidity perspectives.
The Composite Index of Leading Economic Indicators: How to Make It More Timely. Robert H. McGuckin, Ataman Ozyildirim, Victor Zarnowitz. A major shortcoming of the U.S. leading index is that it does not use the most recent information for stock prices and yield spreads. The index methodology ignores these data in favor of a time-consistent set of components (i.e., all of the components must refer to the previous month).