What could a part labeled D2 be in a printed circuit board?

tbspunker

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The resistors are all labeled with R# and it seems the capacitors are named accordingly with C#. What could a part with the labeling D2 be? it looks like a black cylinder with 2 small metal pieces holding it slightly above the board.
any help is greatly appreciated :).

oh ya, and its a LCD power supply, looked for the schematic but couldn't find it.
 
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