Common plugs and sockets determined by two spherical pins with centres spaced at 19 mm are in use in Europe, a lot of that are shown in IEC/TR 60083 "Plugs and socket-outlets for domestic and very similar typical use standardized in member nations of IEC. The 120 volt plug is https://types-of-electrical-plugs78887.blogoxo.com/29496869/plug-types-an-overview