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 The Norrland Dragoon Regiment ( sv, Norrlands dragonregemente), also K 4, is a Swedish Army unit specialized in arctic warfare and special operations. Located in the province of Lappland, it was historically a cavalry unit that traces its orig ...

, a Swedish Army cavalry regiment *

K-4 (SLBM) K-4 is a nuclear capable Intermediate-range submarine-launched ballistic missile developed by the Defence Research and Development Organisation of India to arm the Arihant-class submarines. The missile has a maximum range of about 3,500 km ...

, 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 Interst ...

, 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. Hi ...

, IATA code K4, an American cargo airline *

LNER Class K4 The London and North Eastern Railway (LNER) Class K4 is a class of 2-6-0 steam locomotives designed by Nigel Gresley for the steep grades of the West Highland Line. West Highland Line challenge The North British Railway (NBR) West Highla ...

, a British class of 2-6-0 steam locomotives * London Buses route K4, a Transport for London contracted bus route *

PRR K4s The Pennsylvania Railroad (PRR) K4 4-6-2 "Pacific" (425 built 1914–1928, PRR Altoona, Baldwin) was its premier passenger-hauling steam locomotive from 1914 through the end of steam on the PRR in 1957. Attempts were made to replace the ...

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 c ...

of four vertices * K, in abstract algebra, the

Klein four-group In mathematics, the Klein four-group is a Group (mathematics), group with four elements, in which each element is Involution (mathematics), self-inverse (composing it with itself produces the identity) and in which composing any two of the three ...

* 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 is a musical instrument manufacturing company headquartered in Hamamatsu, Shizuoka, Japan. It is best known for its grand pianos, upright pianos, digital pianos, electronic keyboards and electronic synthesizers. The company was founded in Augus ...

Koalisyon ng Katapatan at Karanasan sa Kinabukasan The Koalisyon ng Katapatan at Karanasan sa Kinabukasan (''K4, Coalition of Truth and Experience for Tomorrow'') is the political multi-party electoral alliance that supported president Gloria Macapagal Arroyo, who won 2004 Philippine presidential ...

(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 th ...

part 4, the last section of the cryptographic puzzle sculpture (currently unsolved)

Military

Transport

Other uses

See also