Every episode of Fringe displayed a series of symbols, called glyphs, before each ad break. There were 8 symbols: an apple, a butterfly, a flower, a frog, a hand, a leaf, a seahorse, and smoke. Each glyph was also paired with a little yellow glowing dot in one of its four corners.
Every combination of glyph + dot location corresponded to a letter, meaning the glyphs were a cypher. The glyphs presented over the course of an episode spelled out a word that was related to that episode, the current arc, the current season, or sometimes the show as a whole.
Check out individual episode pages to see what words were spelled out for each episode, starting with season 1 episode 1, 'Pilot'!
The glyphs were also snuck into episodes as easter eggs for eagle-eyed viewers. Scroll down to see the glyph alphabet and every glyph easter egg in the series.
This glyph has not been spotted in any scenes.
This glyph has not been spotted in any scenes and is not used in the letter cipher. It was used in some promotional material before Fringe premiered.