K3 may refer to:

Transportation

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-3 (Kansas highway), a state highway in Kansas * London Bus route K3 *

Taquan Air Taquan Air is the operating name for Venture Travel, LLC, an American regional airline headquartered in Ketchikan, a city in the southeastern portion of the U.S. state of Alaska. It operates domestic scheduled passenger and charter services. ...

, an Alaskan commuter airline (by IATA code) * K-3 cart *

Kia Forte The Kia Forte (), known as the K3 in Asia, the Forte K3 or Shuma in China and Cerato in South America, Australia, New Zealand and Russia, is a compact car manufactured by South Korean automaker Kia from mid-2008 until 2024, replacing the Kia S ...

, a compact car sold as Kia K3 in South Korea *

Kia K3 (BL7) The Kia K3 is a subcompact car (B-segment) manufactured by Kia since 2023 as a successor to the Rio. Developed under the codename BL7, the K3 is available in hatchback A hatchback is a car body style, car body configuration with a rear d ...

, a subcompact car * LNER Class K3, a class of British steam locomotives * GSWRI Class K3, a

Great Southern and Western Railway The Great Southern and Western Railway (GS&WR) was an Irish gauge () railway company in Ireland from 1844 until 1924. The grew by building lines and making a series of takeovers, until in the late 19th and early 20th centuries it was the larges ...

(Ireland) steam locomotive

Military

Weapons

* K-3 (rifle), an Armenian-made bullpup rifle *

Daewoo K3 The Daewoo Precision Industries K3 is a South Korean light machine-gun. It is the third indigenous firearm developed in South Korea by the Agency for Defense Development, following the Daewoo Precision Industries K1, K1 and Daewoo Precision Indu ...

, a light machine gun

Ships

* Soviet submarine K-3 ''Leninsky Komsomol'', the first Soviet nuclear submarine * , a 1914 United States Navy K-class submarine * , a 1916 British K-class submarine * , a 1940 Royal Navy ''Flower''-class corvette

Other

Pohang Airport Pohang Gyeongju Airport is an airport in Pohang, North Gyeongsang Province, South Korea. In 2011, 255,227 passengers used the airport. History Pohang Airfield was originally developed during the Japanese Imperial period. Military Pre-Korea ...

, by United States Air Force designator during the Korean War *

Life Regiment Hussars The Life Regiment Hussars (; designated K 3) is one of the world's oldest regiments still active. The regiment descends directly from units set up by King Gustav I of Sweden (Gustav Vasa) in 1536, when Sweden set up a draft of horses and ...

, Swedish cavalry regiment * K3, a bombproof WWII submarine pen at the German

Lorient Submarine Base Lorient Submarine Base was a submarine naval base located in Lorient, France. It was built in 1941 by the German Kriegsmarine, and was continued to be enlarged until 1943. After the German defeat it was used by the French Navy. It was decommis ...

in France

Science, technology, computing and mathematics

* The Kleene logic K₃ * 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 ...

on three vertices

K_3

* A version of the

K (programming language) K is a proprietary array processing programming language developed by Arthur Whitney and commercialized by Kx Systems. The language serves as the foundation for kdb+, an in-memory, column-based database, and other related financial products. ...

K3 surface In mathematics, a complex analytic K3 surface is a compact connected complex manifold of dimension 2 with а trivial canonical bundle and irregularity of a surface, irregularity zero. An (algebraic) K3 surface over any field (mathematics), field ...

, a compact complex surface in mathematics *

Menadione Menadione is a natural organic compound with the formula C6H4(CO)2C2H(CH3). It is an analog of 1,4-naphthoquinone with a methyl group in the 2-position. It is sometimes called vitamin K3. Use is allowed as a nutritional supplement in animal ...

, vitamin K₃ * K3, 1774 marine chronometer made by

Larcum Kendall Larcum Kendall (21 September 1719 in Charlbury, Oxfordshire – 22 November 1790 in London) was a watchmaker from Oxfordshire, who was active in London. Early life Kendall was born on 21 September 1719 in Charlbury. His father was a Merce ...

Pentax K-3 The Pentax K-3 is a 24-megapixel Pentax high-end digital single-lens reflex camera with an APS-C sensor, announced on 7 October 2013. The Pentax K-3 is the successor to both the K-5 II and K-5 IIs models, which have a 16-megapixel sensor. The K- ...

, a digital SLR camera

Media and entertainment

K3 (band) K3 is a Belgium, Belgian-Netherlands, Dutch girl group with a Dutch language, Dutch-language Pop music, pop repertoire, consisting of Hanne Verbruggen (singer), Hanne Verbruggen, Marthe De Pillecyn (K3), Marthe De Pillecyn, and Julia Boschman. I ...

, a Belgian/Dutch girl group *

K3 (television) K3 () was a Catalonia, Catalan public broadcasting, public television Television station, channel operated by Televisió de Catalunya available in analogue and Digital terrestrial television, DTT in Catalonia, Balearic Islands, Valencian Communit ...

, a Catalan television channel * '' K3: Prison of Hell'', a 2009 pornographic horror film *

K3 Film Festival Villach (; ; ; ) is the seventh-largest city in Austria and the second-largest in the federal state of Carinthia (state), Carinthia. It is an important Junction (traffic), traffic junction for southern Austria and the whole Alpe-Adria region. , th ...

, a film festival held annually in Villach, Austria, since 2007 *K3, a world in Donkey Kong Country 3: Dixie Kong's Double Trouble!

Other uses

K3 League The K3 League is the third-highest division in the South Korean football league system. It was run as an amateur league until 2019, but was relaunched as a semi-professional league after absorbing the Korea National League in 2020. It is cur ...

, a South Korean football league *

Gasherbrum IV Gasherbrum IV (; ), surveyed as K3, is the 17th highest mountain on Earth and the 6th highest in Pakistan, as well as the highest independent mountain under eight thousand meters in Pakistan. One of the peaks in the Gasherbrum massif, its im ...

, a mountain in the

Karakoram The Karakoram () is a mountain range in the Kashmir region spanning the border of Pakistan, China, and India, with the northwestern extremity of the range extending to Afghanistan and Tajikistan. Most of the Karakoram mountain range is withi ...

previously surveyed as K3. Sometimes erroneously recorded as

Broad Peak Broad Peak (; ) is one of the eight-thousanders, and is located in the Karakoram range spanning Gilgit-Baltistan, Pakistan and Xinjiang, China. It is the 12th highest mountain in the world with elevation above sea level. The first ascent of t ...

. *

Kankakee, Illinois Kankakee ( ) is a city in and the county seat of Kankakee County, Illinois, United States. Located on the Kankakee River, as of 2020, the city's population was 24,052. Kankakee is a principal city of the Kankakee-Bourbonnais-Bradley, IL MSA, Kan ...

, an expression or abbreviation used to identify Kankakee, IL