This example visualizes automobile data from a CSV file, plotting Horsepower against Mileage with points colored by vehicle Make using distinct shapes. The scatter plot uses D3 scales for axes and an ordinal scale mapped to symbol types via `symbolsFill`. A custom shape legend explains the mapping. The code demonstrates D3 v7 modular imports, including `scaleLinear`, `scaleOrdinal`, `symbol`, and `axisLeft`/`axisBottom`, while handling data loading asynchronously through `d3.csv` and updating the visualization via a state-based render loop.