This example visualizes the net worth of the richest people as a pie chart, with colored segments and a legend listing each name alongside its value in billions. It loads CSV data from a GitHub gist via `d3.csv`, then processes the `NETWORTH` field as numbers. The chart uses `d3.pie` and `d3.arc` to generate slices, `d3.scaleOrdinal` for colors, and `d3.format` to display abbreviated tick values. Legends are appended as SVG rectangles and text elements, with the entire graphic rendered in an SVG container.