A useful source:
https://worldofsockets.com/
this post was submitted on 29 Jul 2025
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The pictured one is an universal socket that can accept any plug sold in the eu, because if you go to buy any fridge or oven or washer it comes with the German plug
Otherwise, any other plug (phone chargers, lamps, laptops) comes with the standard which is this:
collapsed inline media
It doesn't fit in a German plug as the diameter of the holes and the spacing is slightly different, hence the weirdly shaped wholes
It has both prongs insulated so you don't get accidentally electrocuted if your finger accidentally touch one during unplugging (especially toddlers)
In my house I exclusively got pure L sockets without the double holes and I wanted to kill the sadist electrician who decided to install them everywhere. (It's a money issue, universal socket by regulations need 2.5 mm² section copper wires, while the 10A L socket can use cheaper 1.5 mm² section copper wires - but still, how much he saved, 50€ in total? Asshole, I had to spend 3x that to replace all the sockets)