This pie chart visualizes the distribution of population (in millions) across income brackets, using a dataset loaded from a GitHub gist. The chart is rendered as an SVG with slices colored by income bracket categories, and includes a legend and axis labels for context. The visualization is built with D3 version 7, employing the `d3.pie` layout, `d3.arc` for generating slice paths, and `d3.scaleOrdinal` with `d3.schemeCategory10` for color mapping. Data is parsed from CSV format and numeric values are coerced to numbers for aggregation.