K – (1) In the metric system, K means 1000. (Example: Km is 1000 meters). (2) In the computer industry, K means 210 or 1024 in decimal figures.
Key system – A telecommunications system with multi-button telephone sets on which more than one outside line terminates, allowing several people to answer or use more than one line. [All hardware is typically located on subscriber premises.]
Key telephone set – A multi-button phone used in a key system.
Kilo – (1) Greek word meaning 1000. (2) Prefix in the international system of measurements. (Example: kilohertz, kilowatts, etc.)