Transportation

• K-3 (Kansas highway)
  K-3 (Kansas highway)
  K-3 is a state highway in the U.S. state of Kansas. It runs through Crawford, Bourbon and Linn Counties in southeastern Kansas.-Route description:...
  
  , a state highway in Kansas
• London Buses route K3
  London Buses route K3
  London Buses route K3 is a Transport for London contracted bus route in London, United Kingdom. The service is currently contracted to London United.-History:...
  
  
• Taquan Air
  Taquan Air
  Taquan Air is the operating name for Venture Travel, LLC, an American regional airline based in Southeast Alaska, USA. It operates domestic scheduled passenger and charter services...
  
  , IATA airline designator for the Alaskan commuter airline

Vehicles

• LNER Class K3, a steam locomotive
• GSWRI Class K3, a Great Southern and Western Railwa Irish steam locomotive
• Soviet submarine K-3 Leninsky Komsomol
  Soviet submarine K-3 Leninsky Komsomol
  К-3 was a project 627 "Кит" submarine of the Soviet Navy's Northern Fleet, the first nuclear submarine of the Soviet Union. The vessel was prototyped in wood, with each of five segments scattered between five different locations about Leningrad, including the Astoria Hotel...
  
  , the first Soviet nuclear submarine
• USS K-3 (SS-34)
  USS K-3 (SS-34)
  USS K-3 was an K-class submarine, of the United States Navy. Her keel was laid down by Union Iron Works in San Francisco, California, as Orca, making her the first ship of the United States Navy to be named for the orca, another name for the grampus or killer whale, but on 17 November 1911,...
  
  , a 1914 United States Navy K-class submarine
• HMS K3
  HMS K3
  HMS K3 was the lead ship of the British K class submarines. She was laid down on 21 May 1915 by Vickers, Barrow-in-Furness. She was commissioned on 4 August 1916.In December 1916, K3, with the future King George VI aboard,...
  
  , a 1916 British K class submarine
• HMS Heliotrope (K03), a 1940 British Navy Flower class corvette

Material

• K3 carbon, a carbon material used for making of items of high strength to weight ratio (such as bicycle frames & bicycle forks)

Items

• YP-K3, a brand of MP3 player by Samsung
• Larcum Kendall
  Larcum Kendall
  Larcum Kendall was a British watchmaker.-Commission:The Board of Longitude asked Kendall to copy and develop John Harrison's ingenious fourth model of a clock useful for navigation at sea...
  
   maritime chronometer

Media

• K3 (band)
  K3 (band)
  K3 is a Flemish/Dutch girl band with a Dutch repertoire, mainly aimed at pre-adolescent children. The name of the group is derived from the names of the three original members: Karen Damen, Kristel Verbeke and Kathleen Aerts. Their music is produced by production company Studio 100 and is written...
  
  , a Belgian/Dutch girl group
• K3 (television)
  K3 (television)
  K3 was a public television channel operated by Televisió de Catalunya available in analogue and DTT in Catalonia, Balearic Islands, Valencia, Andorra, Northern Catalonia and partly in Aragón....
  
  , a Catalan television channel

Other

• K3 League
  K3 League
  The Challengers League is a top amateur football competition in South Korea. Created in 2007, it is the third tier of South Korean football league system-History:2007 was the inaugural season of the K3 League, and ten teams competed in the competition....
  
  , a Korean football league
• K3 (programming language), the third version of the k programming language
  K (programming language)
  K is a proprietary array processing 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. The language, originally developed in 1993, is a variant of APL and...
  
   created by Arthur Whitney
• K3 surface
  K3 surface
  In mathematics, a K3 surface is a complex or algebraic smooth minimal complete surface that is regular and has trivial canonical bundle.In the Enriques-Kodaira classification of surfaces they form one of the 5 classes of surfaces of Kodaira dimension 0....
  
  , a compact complex surface in mathematics
• Menadione
  Menadione
  Menadione is a synthetic chemical compound sometimes used as a nutritional supplement because of its vitamin K activity. It is an analog of 1,4-naphthoquinone with a methyl group in the 2-position.-Terminology:...
  
  , vitamin K₃
• Broad Peak
  Broad Peak
  Broad Peak , is the 12th highest mountain on Earth, with an elevation of 8,051 meters . The literal translation of "Broad Peak" to Faichan Kangri is not accepted among the Balti people.- Geography :...
  
  , a mountain previously called K3

• K3 incense, a herbal mix that is meant to be smoked for recreational purposes