http://en.wikipedia.org/wiki/Justice_League_Watchtower
You may know about this if you follow DC comics. Batman and Company toss around the term 'Watchtower' like it was nothing....
because it is. At one time, I think the word popped up on Jeopardy and most people knew what it was, as a 'brand' or symbol of JW's. As such, you wouldn't expect secular writers to use it because it conveys images of an annoying, minor religion and their magazine. If they had a 5 sided building, I wouldn't expect them to call it 'Pentagon' or use a Swastika just because it was a Tibetan symbol.
One day, landfills will have consumed the mass of Witness literature. They will be as relevant as the Socialist Workers Party. The world will have forgotten them, if it largely hasn't done so already.
metatron