What is that?

After having placed a guessing plate twice in the last few days, I came up with the following idea. Most people do have an object, a tool or something that they don't really know what it is, what it's for, where it comes from or how old it is. Wouldn't it be nice to take a picture of that and place it here? Maybe there's someone here who knows or knows how and where to find out. For the time being, the whatis booster is still quite full, so you can also score with it. That way, we can learn something from each other.