This is a D3.js scatter plot that displays the Iris dataset, mapping sepal length to the x-axis and petal length to the y-axis, with points colored and shaped by species. The visualization uses `d3.scaleLinear` for axes, `d3.scaleOrdinal` with `d3.symbolsFill` to map species to distinct shapes, and `d3.symbol` to render the marker paths. It also includes a custom shape legend built with `d3.symbol`, and axes are generated using `d3.axisLeft` and `d3.axisBottom`. The data is loaded asynchronously from a GitHub-hosted CSV file and parsed with `d3.csvParse`.