OnePlus is a smartphone OEM that may have started out as a "flagship killer", but has branched out into additional areas such as audio accessories and smart TVs since then. Now, it appears it may have another new project underway, which may have started by filing a new trademark application with the United States Patents and Trademarks Office (USPTO).
https://www.notebookcheck.net/OnePlus-registers-a-mysterious-new-trademark-with-the-USPTO.469527.0.html