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.
- Keel
- The draught at the bow and the stern are the same.
- 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.
- KiwiRail
- KiwiRail Limited
- KiwiRail Learning Exchange (KLE)
- A software tool used to manage certification currency and record the results of assessments.
- KMC module
- An electronic module on each locomotive of a train that monitors the current location of the train against the locations of worksites across New Zealand, which it receives over the mobile phone network. It is part of the eProtect system.
- 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