This example visualizes the Iris dataset as a scatter plot, showing the relationship between sepal length and petal length across three species—setosa, versicolor, and virginica. Each species is distinguished by a different geometric shape (circle, square, or triangle), rendered via SVG paths using `d3.symbol` and `d3.scaleOrdinal`. A legend explains the shape-to-species mapping. The code uses D3 v7 to load the CSV data, build linear scales with `scaleLinear`, and render axes with `d3.axisLeft` and `d3.axisBottom`.