This interactive scatter plot visualizes the Iris dataset, displaying sepal length against petal length, with each of the three species represented by a distinct symbol shape. The visualization uses d3.scaleLinear for both axes and d3.scaleOrdinal with symbolsFill to map species to different geometric markers. A legend, generated through the shapeLegend module, explains the species-to-shape correspondence. The code loads CSV data via d3.csvParse from a remote source, applies numeric conversion, and renders SVG marks using the d3.symbol generator.