Right before commercial breaks they have those x-rays of different things (ie: a leaf) and there's a yellow(?) dot on each.
Well, those are characters and every episode the characters spell out a word.
Last season the glyphs spelled out the below:
Pilot<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>O</center>
</td> <td>
<center>B</center>
</td> <td>
<center>S</center>
</td> <td>
<center>E</center>
</td> <td>
<center>R</center>
</td> <td>
<center>V</center>
</td> <td>
<center>E</center>
</td> <td>
<center>R</center>
</td> </tr> </tbody></table> The Same Old Story - Aired<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>B</center>
</td> <td>
<center>R</center>
</td> <td>
<center>E</center>
</td> <td>
<center>L</center>
</td> <td>
<center>D</center>
</td> </tr> </tbody></table> <dl><dd><small> (Originally aired as BRELD, but was rectified to CHILD in the Season One DVD release)</small> </dd></dl> The Same Old Story - DVD<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>C</center>
</td> <td>
<center>H</center>
</td> <td>
<center>I</center>
</td> <td>
<center>L</center>
</td> <td>
<center>D</center>
</td> </tr> </tbody></table> The Ghost Network <table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>A</center>
</td> <td>
<center>E</center>
</td> <td>
<center>G</center>
</td> <td>
<center>E</center>
</td> <td>
<center>R</center>
</td> </tr> </tbody></table> <dl><dd><small>(Note: Aeger is Latin for "Sick")</small> </dd></dl> The Arrival<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>R</center>
</td> <td>
<center>O</center>
</td> <td>
<center>G</center>
</td> <td>
<center>U</center>
</td> <td>
<center>E</center>
</td> </tr> </tbody></table> Power Hungry<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>S</center>
</td> <td>
<center>U</center>
</td> <td>
<center>R</center>
</td> <td>
<center>G</center>
</td> <td>
<center>G</center>
</td> </tr> </tbody></table> <dl><dd><small>(Note: Perhaps supposed to be "surge")</small> </dd></dl> The Cure<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>C</center>
</td> <td>
<center>E</center>
</td> <td>
<center>L</center>
</td> <td>
<center>L</center>
</td> <td>
<center>S</center>
</td> </tr> </tbody></table> In Which We Meet Mr. Jones<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>C</center>
</td> <td>
<center>O</center>
</td> <td>
<center>D</center>
</td> <td>
<center>E</center>
</td> <td>
<center>S</center>
</td> </tr> </tbody></table> The Equation<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>T</center>
</td> <td>
<center>A</center>
</td> <td>
<center>K</center>
</td> <td>
<center>E</center>
</td> <td>
<center>N</center>
</td> </tr> </tbody></table> The Dreamscape<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>V</center>
</td> <td>
<center>O</center>
</td> <td>
<center>I</center>
</td> <td>
<center>C</center>
</td> <td>
<center>E</center>
</td> </tr> </tbody></table> Safe<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>T</center>
</td> <td>
<center>R</center>
</td> <td>
<center>A</center>
</td> <td>
<center>D</center>
</td> <td>
<center>E</center>
</td> </tr> </tbody></table> Bound<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>S</center>
</td> <td>
<center>A</center>
</td> <td>
<center>V</center>
</td> <td>
<center>E</center>
</td> <td>
<center>D</center>
</td> </tr> </tbody></table> The No-Brainer<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>B</center>
</td> <td>
<center>I</center>
</td> <td>
<center>S</center>
</td> <td>
<center>H</center>
</td> <td>
<center>O</center>
</td> <td>
<center>P</center>
</td> </tr> </tbody></table> The Transformation<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>A</center>
</td> <td>
<center>V</center>
</td> <td>
<center>I</center>
</td> <td>
<center>A</center>
</td> <td>
<center>N</center>
</td> </tr> </tbody></table> Ability<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>O</center>
</td> <td>
<center>L</center>
</td> <td>
<center>I</center>
</td> <td>
<center>V</center>
</td> <td>
<center>I</center>
</td> <td>
<center>A</center>
</td> </tr> </tbody></table> Inner Child<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>W</center>
</td> <td>
<center>A</center>
</td> <td>
<center>L</center>
</td> <td>
<center>T</center>
</td> <td>
<center>E</center>
</td> <td>
<center>R</center>
</td> </tr> </tbody></table> Unleashed<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>P</center>
</td> <td>
<center>E</center>
</td> <td>
<center>T</center>
</td> <td>
<center>E</center>
</td> <td>
<center>R</center>
</td> </tr> </tbody></table> Bad Dreams<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>B</center>
</td> <td>
<center>E</center>
</td> <td>
<center>L</center>
</td> <td>
<center>L</center>
</td> <td>
<center>Y</center>
</td> </tr> </tbody></table> Midnight<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>E</center>
</td> <td>
<center>I</center>
</td> <td>
<center>G</center>
</td> <td>
<center>H</center>
</td> <td>
<center>T</center>
</td> </tr> </tbody></table> The Road Not Taken<table class="gallery" cellpadding="0" cellspacing="0"> <tbody><tr> <td>
<center>V</center>
</td> <td>
<center>I</center>
</td> <td>
<center>S</center>
</td> <td>
<center>I</center>
</td> <td>
<center>O</center>
</td> <td>
<center>N</center>
</td> </tr> </tbody></table> There's More Than One of Everything <table class="gallery" cellpadding="0" cellspacing="0"><tbody><tr><td>
<center>G</center>
</td> <td>
<center>R</center>
</td> <td>
<center>A</center>
</td> <td>
<center>V</center>
</td> <td>
<center>E</center>
</td></tr></tbody></table>

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