GB/T 4026-2004
人机界面标志标识的基本方法和安全规则-设备端子和特定导体终端标识及字母数字系统的应用通则
Basic and safety principles for man-machine interface,marking and identifieation-ldentification of equipment terminals and of terminations of certain designated conductors,including general rules for an alphanumeric system
GBT4026-2004, GB4026-2004