A scatter plot of the classic Iris dataset, showing sepal length against petal length for three species of iris flowers. The visualization encodes species through both color and distinct marker shapes: circles for setosa, squares for versicolor, and triangles for virginica, with a custom legend identifying each. Built with D3.js v7, the code loads data from a remote CSV, uses `d3.scaleLinear` for the axes, and renders the symbols using `d3.symbol` with `symbolCircle`, `symbolSquare`, and `symbolTriangle`. The SVG output is styled with CSS and includes labeled axes.