This example displays the classic Iris Dataset, plotting petal width against sepal length and using different symbols to distinguish between the three iris species. The code loads CSV data via `d3.csv`, maps each measurement to numeric values, and uses `d3.scaleLinear` for both axes and `d3.scaleOrdinal` to map species to a set of D3 symbols via `d3.symbol`. A reusable `scatterPlot` function configures margins, axis labels, and symbol size, then renders the chart as SVG with `d3.axisBottom` and `d3.axisLeft`.