This example shows a scatterplot of the Iris flower dataset, plotting sepal length against petal length while encoding species with different point shapes. The visualization includes labeled axes and a shape legend identifying each species. The code uses D3 v7 modules such as `scaleLinear`, `scaleOrdinal`, `symbolsFill`, and `symbol` to generate the marks, with axes and legend built through reusable functions. Data is loaded asynchronously from a GitHub-hosted CSV and parsed using `csvParse`.