Bottle trap. You see them in Germany on wall mounted bathroom sinks.I'm no plumber, but isn't the whole thing upside-down? That lower housing is supposed to be a vent, isn't it? Even then, it would be too close. Aren't they supposed to be as high as possible? and kind of a "last option" type thing, such as an island, where there is no wall, for a vent stack.
Unless that's some kind of trap I have never seen.....if so, ignore me.
I ran across this advertising image for plumbing shutoff valves that had to have been AI generated. Water supply valves attached to a sink drain. There have to be others out there to share so we can all get a chuckle.
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Peter