Ahh, as usual, Wikipedia has the answer. Thanx, Imran. 
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Kosher salt gets its name not because it follows the guidelines for kosher foods as written in the Torah (nearly all salt is kosher, including ordinary table salt), but rather because of its use in making meats kosher, by helping to extract the blood from the meat. Because kosher salt grains are larger than regular table salt grains, when meats are coated in kosher salt the salt does not dissolve readily; the salt remains on the surface of the meat longer, allowing fluids to leach out of the meat.
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