This visualization shows the relationship between age and insurance charges, with points shaped according to sex. The scatter plot uses D3 v7’s `scaleLinear` for both axes and `scaleOrdinal` with `symbolsFill` for categorical shape encoding. A custom legend displays the mapping between shapes and sex using D3’s `symbol` generator. Data is loaded asynchronously from a remote CSV file and parsed with `d3.csvParse`, with axes and labels added via the `axisLeft` and `axisBottom` helpers.