This scatter plot visualizes the Iris dataset, showing sepal length against petal length for three species of iris flowers. Each species is represented by a distinct symbol shape (circle, cross, diamond, and others) generated using d3’s `symbol` API, with a legend identifying the shape-to-species mapping. The chart uses d3’s `scaleLinear` for both axes and `scaleOrdinal` for the shapes, while the axes and legend are built through custom modules (`axes.js` and `shapeLegend.js`). Data is loaded asynchronously from a GitHub-hosted CSV and parsed with `csvParse`.