A scatter plot from the Pima Indians Diabetes dataset shows the relationship between plasma glucose concentration and body mass index, with age encoded through a yellow-orange-red sequential color scale and diabetes outcome represented by shape (circles for low risk, crosses for high risk). The D3 code uses `scaleLinear`, `scaleSequential` with `interpolateYlOrRd`, `axisBottom`, `axisLeft`, and `symbol()` with `symbolCircle`/`symbolCross` for glyphs. Data is parsed via `csvParse` and filtered to exclude rows with zero glucose or BMI values.