godot-module-template/engine/scene/theme/icons/picker_shape_circle.svg

<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16"><path fill="#eaeaea" d="M6.5 2.5a5.5 5.5 0 0 0 0 11 5.5 5.5 0 0 0 0-11m6.5 0h2v11h-2z"/></svg>