This scatter plot visualizes the Iris dataset, showing sepal length on the x-axis and petal length on the y-axis. Each point’s shape encodes the iris species, with a legend mapping the three species to distinct symbols. The visualization uses D3.js and its `scaleLinear`, `scaleOrdinal`, `symbolsFill`, and `symbol` APIs to position marks and generate glyph shapes. Data is fetched from a remote CSV file and parsed with `csvParse`. The chart includes labeled axes and a shape legend, both styled via D3’s `axisLeft` and `axisBottom` helpers.