This scatter plot visualizes the Iris Dataset, encoding petal width on the x-axis, sepal length on the y-axis, and species through distinct symbol shapes from `d3.symbol` with a custom shape legend. The D3 v7 code uses `d3.scaleLinear` for axes, `d3.scaleOrdinal` for shape mapping, and imports utilities for axis rendering and legend generation. A color-coded symbol legend, labeled "Species," identifies the three iris types.