mbostock
The seven symbols supported by d3-shape. Each has a configurable area (here, 2500 square pixels) and is positioned around its centroid.
https://d3js.org/d3-path.v1.min.js
https://d3js.org/d3-shape.v1.min.js
https://d3js.org/d3-selection.v1.min.js
https://d3js.org/d3-timer.v1.min.js