Howling:Theta Sigma

The Howling → Theta Sigma

There be spoilers about un-released stories here.
Run back to the forums if you're scared.

In The Pandorica opens, on the page on this wiki it says that under the words 'HELLO SWEETIE' were coordinates, but does anyone notice that the two first letters (I think) were the greek letters Theta and Sigma, as in Theta Sigma - the Doctor's nickname when he was a child? Coincidence?