This icon is a synchronization icon.
There is an arrow rotating on top of the iPhone, it means that the iPhone system is currently synchronizing data internally, so it shows that rotating icon as a reminder. To close this icon:
1. Connect your phone to a faster network to speed up the sync process, and the icon will automatically disappear after the sync is complete.
2. Go to the iCloud interface in Settings to see if automatic synchronization is set, and stop the items being synchronized.
3. You can also turn off the icon by disconnecting your phone from the Internet, i.e., turning off your WiFi connection and data traffic connection.
4. If the icon doesn't disappear after you turn off the network connection, you can reboot your phone, and all synchronization tasks will be terminated by the system after reboot, which will make the icon disappear automatically.
This is the icon that locks the auto-rotate icon, in order not to let the phone gravity-sensitive auto-rotate, double-click the HOME button, slide your finger to the right underneath, you'll see an icon with a circular arrow in the center, click it