Make your choice

I had a look in my drawers for tiny things, things that I could use my macro lens for.
In one of the drawers I found several different plug adapter, to be used in different parts of the world.
This photo shows four of them. One or two I used already, but the one at the top left? I had no idea where to use it. It appears to be the two pin version of Type I (capital i) used at the other side of the world (for me).