This scatter plot visualizes the Iris dataset, mapping sepal length to the x-axis and petal length to the y-axis. Each point is rendered as a distinct symbol (circle, square, or triangle) corresponding to the flower species, with a custom legend explaining the shapes. The visualization is built using D3 v7, leveraging modules like `scaleLinear`, `scaleOrdinal`, `symbol`, and `csvParse`. Data is loaded asynchronously from a remote CSV file, and axes and labels are drawn via custom functions.