K
- Karakia
- A Māori incantation or prayer used to invoke spiritual guidance and protection.
- Katabatic wind
- A downslope wind generated when the air cools and becomes increasingly dense. Normally prevalent early in the morning after a cool night.
- KHI
- Kawasaki Heavy Industries (the helicopter manufacturer)
- Kilometre mark
- In railway terminology, the system of measuring track distance on the railway line. Rail workers use a kilometre mark to reference a specific location on the line.
- Knot
- A measurement of speed in nautical miles per hour, equivalent to 1.85 km/h.
- Kort nozzle
- A non-rotating nozzle fitted around a marine propeller, used to improve the efficiency of the propeller