K4 or K-4 may refer to:

Military

Daewoo K4 The Daewoo Precision Industries K4 () is a List of 40 mm grenades, 40×53mm 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 (grenade launcher), K-201 hand-hel ...

, a South Korean automatic grenade launcher * HMS ''K4'', a 1915 British K class submarine * K 4 or

Norrland Dragoon Regiment The Norrland Dragoon Regiment (), also K 4, is a Swedish Army unit specialized in arctic warfare and special operations. Located in the province of Lapland, Sweden, Lappland, it was historically a cavalry unit that traces its origins back to the ...

, a Swedish Army cavalry regiment *

K-4 (SLBM) K-4 or Kalam-4 is a nuclear capable Intermediate-range ballistic missile, intermediate-range submarine-launched ballistic missile developed by the Defence Research and Development Organisation of Government of India, India to arm its Arihant-clas ...

, 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 7826 km ...

K-4 (Kansas highway) K-4 is the longest designated State highway#United States, state highway in Kansas, at . It begins north of Scott City, Kansas, Scott City at U.S. Route 83 in Kansas, U.S. Route 83 (US-83) and travels eastward to U.S. Route 59 in Kansas, US-59 ...

, 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. His ...

, 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 Highland ...

, 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 K4 was a class of 425 4-6-2 steam locomotives built between 1914 and 1928 for the Pennsylvania Railroad (PRR), where they served as the primary mainline passenger steam locomotives on the entire PRR system until late 19 ...

or Pennsylvania Railroad Type K4, a class of American 4-6-2 steam locomotives *

Kia K4 (2025) The Kia K4 is a compact car manufactured by South Korean automaker Kia. It was introduced in March 2024 as a replacement for the Forte/K3/ Cerato, while the K3 nameplate was transferred to a subcompact car. The car was first introduced on 2 ...

, a compact car successor to a Kia Forte *

Kia K4 (China) The Kia K4 () is a compact sedan produced by Dongfeng Yueda Kia from 2014 to 2020. It was designed exclusively for the Chinese market, and was positioned between the Kia K3 and Kia K5. The Kia K4 was previewed on the 2014 Beijing Auto Show by ...

, a Chinese compact car by Dongfeng Yueda Kia

Other uses

* K4, a four-man

sprint kayak Sprint kayak is a type of canoe sprint held on calm water. 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. Kayak sprint has been in every sum ...

* K4, a model of the British

red telephone box The red telephone box is a telephone kiosk for a public telephone designed by Sir Giles Gilbert Scott, the architect responsible for Liverpool Cathedral. The telephone box is a familiar sight on the streets of the United Kingdom, its associa ...

* K4, a

normal modal logic In logic, a normal modal logic is a set ''L'' of modal formulas such that ''L'' contains: * All propositional tautology (logic), tautologies; * All instances of the Kripke_semantics, Kripke schema: \Box(A\to B)\to(\Box A\to\Box B) and it is closed ...

* 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 i ...

of four vertices * K, in abstract algebra, the

Klein four-group In mathematics, the Klein four-group is an abelian 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 non-identi ...

K4 (mountain) Gasherbrum II (; ; ); surveyed as K4, is the 13th highest mountain in the world at above sea level. It is the third-highest peak of the Gasherbrum massif, and is located in the Karakoram, on the border between Gilgit–Baltistan, Pakistan and ...

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 K1, adding resonant filters and a DAC PCM wavetable. The K4 incorporated a new type of synthesis called Digital Mult ...

, a digital synthesizer *

Koalisyon ng Katapatan at Karanasan sa Kinabukasan The Koalisyon ng Katapatan at Karanasan sa Kinabukasan also known as K4 or K-4, () was the political multi-party electoral alliance that supported president Gloria Macapagal Arroyo's presidential campaign for a full term. Arroyo won 2004 Philipp ...

(K4, Coalition of Truth and Experience for Tomorrow), a Philippine political coalition * K4, an inscription on the sculpture ''

Kryptos ''Kryptos'' is a sculpture by the United States, American artist Jim Sanborn located on the grounds of the Central Intelligence Agency (CIA) headquarters, the George Bush Center for Intelligence in Langley, Virginia. Since its dedication on Nove ...

Military

Transport

Other uses

See also