This example shows a scatter plot of iris flower measurements, comparing sepal length on the x-axis against petal length on the y-axis, with each of the three species distinguished by a unique symbol shape and accompanied by a custom shape legend. The visualization is rendered using D3 v7, with axes generated via the `axisLeft` and `axisBottom` functions and marks drawn using `symbol()` with `symbolsFill` and a `scaleOrdinal` mapping species to shapes. Data is loaded from a remote CSV file and parsed with `d3.csvParse`, while the chart layout adapts to the full window size.