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  • kbit One thousand bits of memory.
  • Kevlar Aramid fibre used as basis of high-strength composites material.
  • kg Kilogramme (2.20462 lb).
  • kitbuilt Prefabricated aircraft for amateur assembly.
  • KK Kabushiki Kaisha (Japanese company constitution).
  • km/h Kilometres per hour.
  • kN KiloNewtons (Nx10³). See N.
  • knot 1 n mile per hour (1.852 km/h; 1.15078 mph).
  • Krueger flap Hinges down and then forward from below the leading-edge.
  • kVA Kilovolt-amperes.
  • kW Kilowatt, SI measure of all forms of power (not just electrical).