This scatter plot displays Iris flower measurements, plotting sepal length against petal length for three species. The visualization uses SVG symbols from d3.symbol and d3.symbolsFill to differentiate species by shape, with a custom legend showing the shape-to-species mapping. The code imports from d3 modules (d3.axisLeft, d3.axisBottom, d3.scaleOrdinal, d3.extent) to build scales, axes, and marks, while asynchronously loading and parsing the iris dataset from a remote CSV via d3.csvParse.