This D3.js (v7) scatter plot visualizes the Iris dataset, plotting sepal length against petal length for three species. The chart distinguishes species through both color and geometric shapes—diamonds for setosa, squares for versicolor, and triangles for virginica—using d3.symbol and d3.axisBottom/axisLeft. A custom shape legend explains the symbol mapping. Data loads from a remote CSV file via d3.csv, with points rendered as SVG paths within a standard margin-based chart layout.