This visualization is a scatter plot of the Iris dataset showing sepal length on the x-axis and petal length on the y-axis, with points colored by species and encoded with different shapes via a categorical scale. It includes a shape legend for the iris species (setosa, versicolor, virginica) and labeled axes. The plot is rendered using D3.js v7 with SVG paths generated by the `d3.symbol` API, and data is fetched as CSV from a GitHub repository. The modular code imports axis and legend helpers that use `d3.axisLeft`, `d3.axisBottom`, and `d3.scaleOrdinal`.