This D3.js scatter plot visualizes the Iris dataset, mapping petal width on the x-axis and sepal length on the y-axis. Each species is represented with a distinct symbol, determined by the `scaleOrdinal` and `symbols` APIs, with all points rendered at a fixed size. The visualization uses `scaleLinear` for axes, `axisLeft` and `axisBottom` for tick marks, and `symbol().size()` to generate SVG paths. Data is loaded from a CSV via `d3.csv`, and the plot is drawn into a full-window SVG.