This scatter plot visualizes the relationship between sepal length and petal length in the Iris dataset, using different marker shapes to distinguish species. It demonstrates d3's shape encoding via `d3.symbol` and `symbolsFill`, with a custom shape legend generated by `shapeLegend.js`. The visualization loads data from a remote CSV, parses it with `d3.csvParse`, and renders axes using `d3.axisLeft` and `d3.axisBottom` from imported D3 modules. The chart updates reactively through state management and a render function that re-calls the plotting logic.