This scatter plot visualizes the Iris dataset, plotting sepal length against petal length, with points colored and shaped according to species. The visualization uses D3 v7's `scaleLinear` for axes, `scaleOrdinal` with `symbolsFill` for categorical shapes, and a custom legend to map species to distinct symbols. Data is loaded asynchronously from a remote CSV file using `csvParse`, and the axes and legend are rendered via reusable D3 modules.