This example displays a semi-circular pie chart, also known as a donut chart, rendered as SVG. Six data values are visualized as orange arcs with white strokes, arranged from left to right across a half-circle. The visualization uses the d3 pie generator, configured with start and end angles to create the semi-circular shape, and the d3 arc generator to define the inner and outer radii. The arcs are drawn as SVG path elements using the `d3.select` API.