3.1.6. Pin Naming

If the function of a pin is absolutely clear (e.g. anode/cathode of a diode), choose its abbreviated functionality as name (e.g. “A” for anode and “C” for cathode). If the functionality is not clear in the symbol (because it’s defined by the component using that symbol), just use numbers starting with “1” at top left and increment them counterclockwise.