<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32"><path d="M 15 5 L 15 15 L 5 15 L 5 17 L 15 17 L 15 27 L 17 27 L 17 17 L 27 17 L 27 15 L 17 15 L 17 5 Z"/></svg>
info at phpclasses dot org