This scatter plot visualizes the Iris dataset, mapping sepal length on the x-axis and petal length on the y-axis. Each point represents a flower sample, with its species indicated by a distinct fill symbol—circles, squares, and diamonds—as defined by the `symbolsFill` palette. The chart includes labeled axes and a custom shape legend explaining the species-to-symbol mapping. The visualization uses D3.js version 7, leveraging `scaleLinear`, `scaleOrdinal`, and `symbol` to create the plot and its interactive legend.