For those who don't know, Prince legally changed his name to a made-up unpronounceable symbol in the early 90's to sidestep restrictions in the contract he had signed with his record company, Warner, which at the time had the rights to use the name "Prince" for music and merchandise.
After the legal name change, news outlets started calling him "the artist formerly known as Prince." Meanwhile, Warner had no rights to the new, unpronounceable name. Warner executives likely were not too happy about that, but couldn't do anything about it.
In 2000, after the contract with Warner expired, Prince went back to using his old name.