When they put up the new CFUN sign out front on, or near to, that historic day in 1973, somebody mis-read the plan-a-gram and the number 14 wound up on the bottom of the vertical stack instead of on the top where it was intended to be.
I guess someone informed management / accounting how much it would cost to change it back around and an executive made an executive decision which was:
"@#$% it. Looks fine to me".
And so it stayed that way for nearly 20 years.
..or so the legend goes. Others maintain the 14 was put on the bottom intentionally so that the actual call letters were were higher and more prominently displayed. Still another story is that they tried it with the 14 on top but, symmetrically, it just looked off-balance. I don't know the truth but I like the first story best.