The hanger doesn’t appear to have a universally recognized meaning when attached to a car door. It is much more likely to be a personal joke, prank, temporary decoration, or an inside signal that only the owner understands.
The interesting part is that the same simple object can have completely different associations depending on the context. The coat hanger can be an ordinary household object, a historical political symbol, or simply something someone decided to tape to their car for reasons known only to them.
If you saw this exact car in a parking lot, the safest conclusion is: don’t assume it is a threat or secret warning. It’s probably just one of the world’s strangest car decorations.
