Welcome to Android Central - It's nice to have you aboard. It seems like either the phone wasn't booted properly, or you have a dead battery. If you haven't yet fixed the problem - here is what you can do. Remove and reinsert the battery. Connect the phone to a AC wall charger and let it charge for some time.
I hope you find a solution to this problem. Good luck.
Welcome to the forums. Typically that type of icon will mean that something failed to download, update, send, or upload. But it can also mean that an account thats attatched to your phone did not log in properly. It can vary depending on which android device you are using, but wont vary by much.