K4 or K-4 may refer to:
Military
*
Daewoo K4
The Daewoo Precision Industries K4 is a 40x53mm high-speed Automatic Grenade Launcher in use with the Republic of Korea Armed Forces.
The K4 was developed as a complement to the K-201 hand-held grenade launcher (attachable to the K2).
Histo ...
, a South Korean automatic grenade launcher
*
HMS ''K4'', a 1915 British K class submarine
* K 4 or
Norrland Dragoon Regiment, a Swedish Army cavalry regiment
*
K-4 (SLBM), an Indian submarine-launched ballistic missile
*
USS ''K-4'' (SS-35), a 1914 United States Navy K-class submarine
Transport
*
China Railway K3/4
The China Railway K3/4 train is a weekly international K-series train from Beijing to Moscow via Ulaanbaatar mainly using the Trans-Siberian and Trans-Mongolian railways.
The train started running in 1959, covering a distance of 7826km, and i ...
*
K-4 (Kansas highway)
K-4 is the longest designated state highway in Kansas, at . It begins north of Scott City at U.S. Route 83 (US-83) and travels eastward to US-59 near Nortonville in northeast Kansas. A segment of the highway in Saline County overlaps Inters ...
, a highway in Kansas
*
Kalitta Air
Kalitta Air is an American cargo airline headquartered at Willow Run Airport, Ypsilanti Township, Michigan. The company operates international scheduled and cargo charter services. Its call sign "Connie" is from its founder, Connie Kalitta.
...
, IATA code K4, an American cargo airline
*
LNER Class K4, a British class of 2-6-0 steam locomotives
*
London Buses route K4, a Transport for London contracted bus route
*
PRR K4s or Pennsylvania Railroad Type K4, a class of American 4-6-2 steam locomotives
Other uses
* K4, a Security company
* K4, a four-man
sprint kayak
Sprint kayak is a sport held on calm water (lakes, flatwater streams, etc. with little waves). The paddler is seated, facing forward, and uses a double-bladed paddle pulling the blade through the water on alternate sides to propel the boat forward ...
* K4, a model of the British
red telephone box
The red telephone box, a telephone kiosk for a public telephone designed by Sir Giles Gilbert Scott, is a familiar sight on the streets of the United Kingdom, Malta, Bermuda and Gibraltar.
Despite a reduction in their numbers in recent years, ...
* K4, a
normal modal logic In logic, a normal modal logic is a set ''L'' of modal formulas such that ''L'' contains:
* All propositional tautologies;
* All instances of the Kripke schema: \Box(A\to B)\to(\Box A\to\Box B)
and it is closed under:
* Detachment rule (''modus po ...
* K, in graph theory, the
complete graph
In the mathematical field of graph theory, a complete graph is a simple undirected graph in which every pair of distinct vertices is connected by a unique edge. A complete digraph is a directed graph in which every pair of distinct vertices is ...
of four vertices
* K, in abstract algebra, the
Klein four-group
In mathematics, the Klein four-group is a group with four elements, in which each element is self-inverse (composing it with itself produces the identity)
and in which composing any two of the three non-identity elements produces the third one. ...
*
K4 (mountain) or Gasherbrum II, a mountain between China and Pakistan
*
Kawai K4
The Kawai K4 is a 61 key synthesizer manufactured in 1989 by Kawai. It contains several features beyond those offered on Kawai's K1, adding resonant filters and a DAC PCM wavetable. The K4 incorporated a new type of synthesis called Digital M ...
, a digital synthesizer made by
Kawai Musical Instruments
*
Koalisyon ng Katapatan at Karanasan sa Kinabukasan (K4, Coalition of Truth and Experience for Tomorrow), a Philippine political coalition
* K4 refers to
Kryptos
''Kryptos'' is a sculpture by the American artist Jim Sanborn located on the grounds of the Central Intelligence Agency (CIA) in Langley, Virginia. Since its dedication on November 3, 1990, there has been much speculation about the meaning of ...
part 4, the last section of the cryptographic puzzle sculpture (currently unsolved)
See also
*
4K (disambiguation)
{{Letter-Number Combination Disambiguation