godot/scene/theme/icons/color_picker_bar_arrow.svg

<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 16 20"><path fill="#b2b2b2" stroke="#b2b2b2" stroke-linejoin="round" d="m3.564 15.218h8.872l-4.436-4.436z"/></svg>