What's a flaming pie?

Alright, I know that I've had a lot of posts today, but it's my first day with the blog so I'm a bit excited. Anyway, some of you might be confused as to what the title means. Well aside from the fact that Paul wrote a song called that after the Beatles, John was quoted as saying that he got the name Beatles in a vision. "So we will tell you. It came in a vision-a man appeared on a flaming pie and said to unto them, 'From this day you are the Beatles with an A.'-Thank you Mister Man,' they said, thanking him"