Just before each commercial, Fringe shows an unusual graphic image. Six-fingered x-rays, apples with tiny babies as seeds, weird stuff (which is totally approproate for the show). They have always looked to me like symbols, and someone has broken the code. (Could be spoilers in the article, but I don’t think so.)
The graphics from each episode spell out a word. (I have noticed that they don’t always put up a graphic before the break, so maybe the word is done by then.) The cipher is not quite finished, and the words are still coming out in each episode, so it’s an unfolding mystery what all these words mean.
Let me just take this opportunity to again mention that Fringe is one of the best shows on television today, and if you’re not watching it, I highly recommend it.