This example displays a scatter plot of the Iris dataset, showing sepal length against petal length. Each point’s symbol (circle, triangle, or square) encodes the iris species, and a legend identifies these shapes. The visualization uses D3 v7 with `scaleLinear`, `scaleOrdinal`, and `symbol` to render marks, plus custom axis and legend modules. It loads the CSV data from GitHub, scales numeric fields on load, and renders interactively in the browser window.