welcome to the forum. yes there's a lot to explore. it might be ur backup ass't. if the icon is showing that notification, u can drag the screen down and click it and hopefully let's u know what it is.
Welcome if you any weather apps it could be a weather alert cause my alerts with weather bug look the same. Any weather apps installed that you know of
Good look QS that is a common one I over looked. You can try to log into that account again or delete it in my accounts and create that account again and it should take the triangle away