A radial barometer chart displays the population of the top 10 most populous countries from the 2017 World Population Prospects estimate. Using D3.js v6 with SVG rendering, the visualization maps population values to a semicircular gauge with a color gradient, major and minor graduation marks, and annotation labels. The chart employs D3's arc generator, scale functions, and data binding to render the population data, with a needle positioned to indicate a percentage value derived from the dataset.