304 Cool Silver, Diffuse / Speckle Black-Silver/Speckle DBGray-Silver
BrickLink: Speckle Black-Silver, Speckle DBGray-Silver
Peeron: BlackGlitter, DkStoneGlitter
This color was introduced in 2005, with Vikings. It was a very common color in Fantasy Era, and even Ninjago. Last used in 2013 (LotR), but it's probably still current.
This color looks very different depending on what color it's coated over. On the right is black, the small helmet on the left is Dark Bluish Gray, and I'm not sure what the large two parts are -- Pearl Dark Gray? In any case, Lego only goes by the coating name for these, so they are all technically the same color.