Actually that parking sign may come from an old German parking sign, see this comment: https://news.ycombinator.com/item?id=39666622 https://news.ycombinator.co

Actually that parking sign may come from an old German parking sign, see this comment: https://news.ycombinator.com/item?id=39666622 https://news.ycombinator.com/item?id=39666622 .