G is number 7 in the alphabet, and D, letter No 4. 7-1=6 and if you add that 1 to 4 you get...well, ...5. But I'll get back to that.
As far as the O goes, well it's letter number 15. 15-9=6. Now here's where it gets really interesting. If you subtract 1 from the 9 and add it to the 5 we had before you get the third 6 and you've got an 8 left over which, if you push it over turns into an infinity!! How about that for significant. Also if you subtract 6 from 15 instead of 9 the math is the same so that just proves it.
Alternatively, you could cut a piece out of the letter O in the top right hand corner then curve the left side around until it touches the right and then you've got a 6 and then you can straighten out the bit you removed and it becomes a 1. 5+1=6!!!!!!!
Furthermore, if you do the math in the first paragraph and then add the numerals of the 15 (for the letter O) together you get 665, the Neighbour of the Beast which makes sense when you consider that God is omnipresent.