Additional Info
This decoration exists in the decorations list but does not seem to actually exist in-game or have any way of actually getting it. This decoration was added to the in-game files in Update 2.9 with a bunch of similar sign decorations, and is listed as “Source: Crafted (Industrial Prefabs)” but it is not actually craftable in anyway in-game. It is unclear why they exist in the decorations lists and were not formally added to the game.