GB/T 16901.3-2003

This standard specifies the classification and encoding rules for connection points, networks, and their associated codes used in graphical symbols within product technical documentation. It is applied in engineering fields such as electrical, electronic, and mechanical design to ensure consistent representation of interconnections and network structures in schematics, wiring diagrams, and system layouts. The standard facilitates unambiguous communication among engineers, manufacturers, and maintenance personnel during product development, testing, and documentation.