This visualization shows a hierarchical tree of autism spectrum disorder (ASD) trait categories, branching from a root node into five main groups: age in months, Qchat-10 scores, ethnicity, gender, and family history. Each top-level category uses distinct node shapes—circles, rectangles, triangles, crosses, and diamonds—with matching colors to differentiate data types. The D3.js v5 tree layout arranges nodes in a tidy, left-to-right branching structure, with SVG paths drawing curved links between parent and child nodes. The code builds the hierarchy with `d3.hierarchy()` and `d3.tree()`, while custom shape and color scales map ordinal categories to visual encodings.