A scatter plot displays iris flower measurements, with sepal length on the x-axis and petal length on the y-axis, while distinct D3 symbol shapes (from `symbolsFill`) encode the flower species. The visualization uses D3 v7's `scaleLinear`, `scaleOrdinal`, `symbol`, and `axisLeft`/`axisBottom` to construct the chart and a custom legend. Data loads asynchronously from a CSV file of the classic Iris dataset hosted on GitHub, which is parsed and typed using `d3.csvParse`.