This scatter plot visualizes the relationship between sepal length and petal length in the Iris dataset, with each point’s symbol shape encoding the flower’s species. A custom legend explains the shape-to-species mapping. The visualization uses d3.scaleLinear for both axes, d3.scaleOrdinal with symbolsFill for shapes, and d3.axisLeft/axisBottom for tick marks. Data is loaded as CSV from GitHub and parsed with d3.csvParse, while updates are managed through a state-based render loop in the viz module.