The cool thing is in Switzerland with the T15 / T25 plug you can use from a small 230V LN plug, 230V LNPE plug or a 3x400V 3LNPE plug. You see this often in workshops. I think this is unique in the world.[1]

Also the 3xT13, 3 plugs where everywhere else in the world is just one plug. [2]

[1] https://de.m.wikipedia.org/wiki/SN_441011

[2] https://hager.com/de-ch/katalog/produkt/wh22730700k-ka-eb-st...