Keytype: A basic stamp design used for the issues of two or more postal authorities which include captions of respective countries, denominations etc. Earlier colonial issues of Britain , France , Spain , Germany and Portugal are keytypes.
Killer bars: Horizontal lines used for stamp cancellations.
Killer: A term used to describe particularly heavy obliterations
Kiloware: Collections made up of a variety of postally used stamps that are mounted on envelope corner paper. Kiloware is sometimes sold by the kilogram (about 2.2 pounds)