https://www.reuters.com/article/us-huawei-tech-peru/huawei-files-to-trademark-mobile-os-around-the-world-after-u-s-ban-idUSKCN1TD2HN >China's Huawei has applied to trademark its "Hongmeng" operating system (OS) in at least nine countries and Europe, data from a U.N. body shows, in a sign it may be deploying a back-up plan in key markets as U.S. sanctions threaten its business model.