Gauntlet of Rassilon

 was a weapon used by Lord President of the Time Lords, Rassilon.

History
Rassilon used the glove to disintegrate a Time Lady when she told him it might be better that the Time Lords died. Along with other Time Lords, Rassilon escaped the Time Lock and travelled to Earth. He used the gauntlet to destroy the Master's facial template set upon the humans. He then also attempted to kill both the Master and the Tenth Doctor, but failed to kill either. (TV: The End of Time)

Although it is never referred to as such on screen, this item could well be called the "Gauntlet of Rassilon", considering so many other objects of "great importance" are called the "__________ of Rassilon".