The eleventh letter and eighth consonant of the English alphabet; the eleventh character also of the Phenician alphabet, from which it has come to us through the Latin and Greek.In chem., the symbol for potassium (NL. kalium).As an abbreviation: [lowercase] In meteorology, of cumulus (c being used for cirrus).Of king, knight, etc.: as, K. G., Knight of the Garter.OfIn math., k is generally a constant coefficient. It is also a unit vector perpendicular to i and j.As a numeral in medieval use, 250.As an abbreviation: In electricity, of kathode (cathode, which see) and kathodic (cathodic).In mathematics: The Lemoine point in geometry.In mineralogy, the middle letter of the general symbol hkl, given to the face of a crystal in the system of Miller. See symbol, 7.In phys.: The symbol usually employed for moment of inertia. The letter K is used by some writers as a symbol of electrostatic capacity, but C is now almost universally adopted for this quantity.A symbol usually employed to designate magnetic susceptibility.A symbol for absolute temperature.