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.
Username relevant. Most people would imagine a yellowish-white popcorn shaped dress and poofie shoulders, maybe her hair is shaped like a popped kernel. Not you, you can't be that whimsical, she has to be a popcorn smuggling heiress with undoubtedly greasy thighs.