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 7826km, and i ...

K-3 (Kansas highway) K-3 is a state highway in southeastern Kansas that runs through Crawford, Bourbon and Linn counties from K-47 near Girard to K-31 near Blue Mound. It was designated around 1932, and the entire route was paved by 1958. The road is maintained b ...

, 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. It ...

, an Alaskan commuter airline (by IATA code) *

K-3 cart The K-3 cart is a 2-wheel, strongly constructed wire cart, similar to artillery caissons, but equipped for carrying and reeling out wire; used together with Signal cart, type K-4, to form the wagon formerly called "Pintle wire wagon, model 1910." ...

* Kia Forte, sold as Kia K3 in South Korea *

LNER Class K3 The Great Northern Railway Class H4 (classified K3 by the LNER) was a class of 2-6-0 steam locomotive designed for mixed-traffic work. The type was a more powerful development of the earlier H3 ( LNER K2) class and was notable at the time, ...

, a steam locomotive * 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 GS&WR grew by building lines and making a series of takeovers, until in the late 19th and early 20th centuries it was the ...

(Ireland) steam locomotive

Military

;Units * Life Regiment Hussars, Swedish cavalry regiment ;Weapons *

K-3 (rifle) The K-3 is an Armenian bullpup assault rifle chambered for 5.45×39mm ammunition with a selective fire system, selecting between semi-automatic mode, burst mode, and full automatic fire mode. Little is known about the production and varia ...

, 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 submachine gun and Daewoo Prec ...

, 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 ;Airfields * Pohang Airport, by United States Air Force designator during the Korean War

Science, technology, computing and mathematics

* The

Kleene logic In logic, a three-valued logic (also trinary logic, trivalent, ternary, or trilean, sometimes abbreviated 3VL) is any of several many-valued logic systems in which there are three truth values indicating ''true'', ''false'' and some indeterminate ...

K₃ * 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. T ...

* K3 surface, a compact complex surface in mathematics * Menadione, vitamin K₃ * K3, 1774 marine chronometer made by Larcum Kendall * Pentax K-3, a digital SLR camera

Media and entertainment

* K3 (band), a Belgian/Dutch girl group * K3 (television), a Catalan television channel * '' K3: Prison of Hell'', a 2009 pornographic horror film *K3, a world in Donkey Kong Country 3: Dixie Kong's Double Trouble!

Other uses

* K3 League, a South Korean football league * Gasherbrum IV, a mountain in the

Karakoram The Karakoram is a mountain range in Kashmir region spanning the borders of Pakistan, China, and India, with the northwest extremity of the range extending to Afghanistan and Tajikistan. Most of the Karakoram mountain range falls under the ...

previously surveyed as K3. Sometimes erroneously recorded as Broad Peak. *

Kankakee, Illinois Kankakee is a city in and the county seat of Kankakee County, Illinois, United States. As of 2020, the city's population was 24,052. Kankakee is a principal city of the Kankakee-Bourbonnais-Bradley Metropolitan Statistical Area. It serves as an ...

, an expression or abbreviation used to identify Kankakee, IL {{Letter-Number Combination Disambiguation