"Torchwood" - over-used in season two.
In Love & Monsters, a newspaper headline said "Saxon leads poll with 64%". In The Runaway Bride, just before the tank fired at the star shaped spaceship the driver says "Orders from Mr Saxon. Fire at will".
And other posters reading "Vote Saxon" have been spotted in other Dr Who related filming.
In possibly the worst anagram ever, re-arranging SAXON does come up with AXONS, who were an adversary of the Third Doctor. Still, only speculation at this point.
Incidentally, tthjinni would naturally prefer the word to be "stopwatch" or "banana". I do feel confident that the upcoming Stephen Moffat ep will include the b word, as all his previous eps have. :P