It doesn't mean anything. But so far, the only connection between that particular greek letter and Doctor Who is the character known as Omega, so I think it's perfectly natural to wonder if there's something going on there. It would be like seeing the "Q" letter on a flag in a Star Trek movie.WHY? WHY? WHY? WHY? WHY DOES SEEING A GREEK LETTER ON A FLAG MEAN OMEGA IS COMING BACK?!
Omega is just symbolic of the last. If they had used the English alphabet and put a Z on the flag would it mean that Zorro was the great returning enemy?
That disembodied voice in the finale of Series 5 reminded me of Omega.
It's funny how fandom fixates on the certain characters for a while, last year everyone kept saying that The Rani was returning, this year, Omega.
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