This scatter plot visualizes the relationship between free and total sulfur dioxide levels in wine samples, with each point colored and shaped according to wine quality rating. Using D3.js v6, the visualization maps quality scores to distinct colors via a lookup object and applies different SVG symbol types through `d3.symbol()` and the `shapeMap` dictionary. The code loads wine quality data from a remote CSV file using `d3.csv()`, processes the numeric values, and renders the chart as an SVG with `d3.scaleLinear` axes and `d3.axisBottom`/`d3.axisLeft` for the x and y scales.