This example visualizes the Iris dataset with a scatter plot comparing sepal length against petal length for three species (`setosa`, `versicolor`, and `virginica`). Each species is distinguished by a unique geometric symbol—circles, squares, and triangles—and assigned a distinct color (red, blue, and green). The visualization renders in SVG using D3 v7, with `d3.axisBottom` and `d3.axisLeft` for axes, `d3.scaleLinear` for positioning, and `d3.symbol` to generate the point shapes. Data is loaded from a remote CSV file, with a legend displaying each species’ shape and color.