This scatter plot matrix uses the D3.js library to visualize the US Police Shootings dataset, with age, year, and month as the three variables. The splom displays all pairwise combinations of these variables in a grid of small multiples, with each cell showing a bivariate scatterplot. The code uses `d3.csv` to load the data, `d3.timeParse` to parse dates, and `d3.scaleLinear` with `d3.axisLeft` and `d3.axisBottom` for the axes. Column and row labels identify each variable, and the SVG rendering uses semi-transparent points to reveal overlapping data density.