K K-DISPLAY Radar display in which a target appears as a pair of vertical deflections. Difference in pulse height indicates direction and magnitude of antenna azimuth pointing error. KEY A device designed to assure that the coupling of two compo- nents can occur in only one position. KEYING SLOT A slot in a printed board that permits the printed board to be plugged into its mating receptacle but prevents it from being plugged into any other receptacle. KEYWAY A general term covering both keying slots and polarizing slots. KICKER A strip of wood nailed to the floor to retrain other dun- nage bracing. KILL PROBABILITY The chance that a target will be destroyed by a given operation. The likelihood of producing the desired kill under the conditions specified. Kill probability is a function of guidance accuracy and the radius of warhead action. KILOHERTZ (kHz) A unit of frequency equal to one thousand cycles per second. KILOWATT A unit of power equal to one thousand watts. KIT DRAWING A kit drawing identifies an item or group of items with instructions for their use. The kit does not necessarily define a complete functional assembly. A kit drawing establishes item iden- tification for the kit, not for the items in the kit. KNIFE LINE ATTACK A form of weld decay sometimes observed on stabilized stainless steel in which the zone of attack is very narrow and close to the weld. KNOWN GOOD BOARD A fault-free circuit board. KNUCKLE AREA The area of transition between sections of dif- ferent geometry in a filament wound part. KNURL Tool with teeth on its periphery used to produce an imprint of the teeth on the cylindrical surface of the work. 157