This D3.js v6 scatter plot visualizes the Iris dataset, mapping petal width and sepal length on the x and y axes while encoding species with custom symbols and colors. The implementation uses the `csv` function to load data and a reusable `scatterPlot` module built with `scaleLinear`, `scaleOrdinal`, `axisLeft`, `axisBottom`, and `symbol`. Markers are rendered as SVG paths, with fill colors determined by a switch statement that assigns red, violet, and orange to the three iris species. The plot fills the entire browser window and includes labeled axes.