Hard Disk name changed to string of characters

I noticed half an hour ago that the name of my Hard Disk had changed to a string of about eight mathematical-looking characters. I was running First Aid to see if there was a reason I cannot edit Times of Events in Calendar. When I ran First Aid I saw the weird name for the Hard Disk.

Here is the string which I found in Safari History as I had searched for it on Google:

=: m,.]\