Noticed this plug on my wall from when I moved into this house, and I just started wondering again about what it’s actually for. This is in the UK, if that helps. It’s on a big bulky box hanging on the wall below my desk next to two regular plug sockets.
Edit: best suggestion I’ve seen here is that it could be a fuse box for an alarm system. Makes sense since this house did have several security systems before I moved in. Also, for added context, this is in a bedroom and the wire coming out of it goes straight into the wall.
Not a plug, but a fuse box - that small panel would open up/pull out to let you replace the fuse. Couldn’t tell you what it’s for without more info
Anything is a plug if you’re brave enough to stick your penis in the hole!