Pressure Plates are traps encountered in Dragon Age: Origins and Dragon Age: Origins - Awakening. They are large plates that sit just above floor level and depress when enough pressure is applied by an intruder.
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They tend to be placed in front of various inconspicuous statues, which tend to breathe fire when their respective plate is triggered. These plates are also the largest traps encountered and can be difficult to avoid in the midst of battle, but the damage caused by triggering one can often be negated by simply moving out of the fire.
You can disarm them with the Mechanical Expertise skill or high Cunning score and it will yield 30-60 experience points for doing so.