There's the one true plug system, IEC 60906-1: https://en.m.wikipedia.org/wiki/IEC_60906-1 https://en.m.wikipedia.org/wiki/IEC_60906-1 It's also a fascinating

There's the one true plug system, IEC 60906-1: https://en.m.wikipedia.org/wiki/IEC_60906-1 https://en.m.wikipedia.org/wiki/IEC_60906-1 It's also a fascinating example of standards proliferation (https://xkcd.com/927/ https://xkcd.com/927/).