Electrical engineering
A connection diagram represents the target information for each connection point of an object. A connection point, in this context, might be the terminal relative to the terminal strip, the pin relative to the plug, etc. If the connection points are terminals, then we speak of a terminal-connection diagram; if they are general devices, we speak of a device-connection diagram; if they are the end points of connections, then we speak of a cable-connection diagram, and if they are the connection points of plugs, then we speak of the pin-connection diagram.