Is there any meaning or symbolism in the letter Q or the number 17 ? Definetly it isn't a biblical number (3,7,12,40,etc)
EDIT : I knew that it was because Q is the highest level of clearance. I wanted to know why the letter "Q" and not P, D, M, E,X, etc.
Gospel of Q is hypothetical because there is no evidence it ever existed.
That is true, but I still wouldn't be surprised if that is why they picked the letter.