This example presents a scatter plot of the Iris dataset, mapping sepal length on the x-axis and petal length on the y-axis, while using different marker shapes to distinguish the three flower species. The visualization imports D3 v7 modules such as `scaleLinear`, `scaleOrdinal`, `symbol`, and `axisLeft`/`axisBottom` to build the chart and axes. It also includes a custom shape legend rendered via `symbolGenerator`. Data is loaded asynchronously from a CSV file using `csvParse`, with numeric fields parsed before the plot is updated.