ISO/IEC TR 24720:2008描述了使用本文概述的直接零件标记（DPM）方法将永久机器可读符号应用于项目（包括组件、零件和产品）的几种方法。ISO/IEC TR 24720:2008描述了有助于产生质量符号的标记方法、标记表面处理、标记位置、保护涂层和其他参数，但未规定要编码的信息。

ISO/IEC TR 24720:2008 describes several methods for applying permanent machine-readable symbols to items - including components, parts and products - using the direct part marking (DPM) methods outlined herein. ISO/IEC TR 24720:2008 describes marking methods, marking surface preparation, marking location, protective coatings and other parameters that contribute to the production of quality symbols, but does not specify the information to be encoded.