godot-module-template/engine/editor/icons/VisualShaderPort.svg

<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10"><path fill="#fff" d="M2 0a1 1 0 0 0-1 1v8a1 1 0 0 0 1.555.832l6-4a1 1 0 0 0 0-1.664l-6-4A1 1 0 0 0 2 0z"/></svg>