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L4 or L-4 may refer to :


Transportation

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SP&S Class L-4 The Spokane, Portland and Seattle Railway The Spokane, Portland & Seattle Railway (SP&S) was a railroad in the northwest United States. Incorporated in 1905, it was a joint venture by the Great Northern Railway and the Northern Pacific Railway ...
, an 1884 steam locomotives class * USS ''L-4'' (SS-43), a 1915 United States Navy L-class submarine * HMS ''L4'', a 1918 British L class submarine *
Lawson L-4 The Lawson L-4 was the last in a series of Lawson biplane airliners designed and built by Alfred Lawson under the livery of the Lawson Airplane Company of Milwaukee, Wisconsin. The largest of the series, it was designed for long-distance flight ...
, a 1924 American unflown biplane airliner *
Piper Cub The Piper J-3 Cub is an American light aircraft that was built between 1938 and 1947 by Piper Aircraft. The aircraft has a simple, lightweight design which gives it good low-speed handling properties and short-field performance. The Cub is P ...
(U.S. military designation: L-4), an aircraft *
Inline-four engine A straight-four engine (also called an inline-four) is a four-cylinder Reciprocating engine, piston engine where cylinders are arranged in a line along a common crankshaft. The vast majority of automotive four-cylinder engines use a straight-f ...
(L4), a type of inline internal combustion four cylinder engine **
Liberty L-4 Created in 1917, the Liberty L-4 was a four-cylinder water-cooled inline aircraft engine developed in the United States during World War I. The Liberty L-4 was an experimental engine of , which was built by the Hudson Motor Car Company and prim ...
, a World War I four-cylinder, water-cooled, inline, aero-engine *
Lynx Aviation Lynx Aviation, Inc. was a regional airline based in Denver, Colorado, United States. The airline began as a sister company to, and operated feeder service for, Frontier Airlines. The Lynx name plays off of the tail pictures of its planes, specifi ...
(IATA code) * L4 (New York City bus), a temporary bus route in New York City *
Chaika L-4 The Chaika L-4 (чайка, en, Seagull) is a twin engine amphibious aircraft, designed and built in Russia in the 2000s. It has sold in small numbers and remains in production. Design and development Several companies and groups have developed ...
, a Russian twin-engined amphibious aircraft * Soviet submarine L-4


Science and technology

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L4 microkernel family L4 is a family of second-generation microkernels, used to implement a variety of types of operating systems (OS), though mostly for Unix-like, ''Portable Operating System Interface'' ( POSIX) compliant types. L4, like its predecessor microkerne ...
, a family of operating system kernels *L4, the transport layer in the
OSI model The Open Systems Interconnection model (OSI model) is a conceptual model that 'provides a common basis for the coordination of SOstandards development for the purpose of systems interconnection'. In the OSI reference model, the communications ...
of computer communications * L4, the fourth
Lagrangian point In celestial mechanics, the Lagrange points (; also Lagrangian points or libration points) are points of equilibrium for small-mass objects under the influence of two massive orbiting bodies. Mathematically, this involves the solution of ...
in an astronomical orbital configuration * L4, an Lp space for p=4 (sometimes called Lebesgue spaces) * L-4, the fourth iteration of
L-carrier The L-carrier system was one of a series of carrier systems developed by AT&T for high-capacity transmission for long-distance communications. Over a period from the late 1930s to the 1970s, the system evolved in six significant phases of develop ...
, high capacity frequency division multiplex over coaxial cable used by the Bell System


Biology

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Haplogroup L4 (mtDNA) Haplogroup L4 is a human mitochondrial DNA (mtDNA) haplogroup. It is a small maternal clade primarily restricted to Africa. L4 is important in East Africa. The highest frequencies are in Tanzania Tanzania (; ), officially the United R ...
, a human mitochondrial DNA haplogroup *
Ribosomal protein L4 60S ribosomal protein L4 is a protein that in humans is encoded by the ''RPL4'' gene. Ribosomes, the organelles that catalyze protein synthesis, consist of a small 40S subunit and a large 60S subunit. Together these subunits are composed of 4 RNA ...
, a human gene * L4, a
lumbar vertebra The lumbar vertebrae are, in human anatomy, the five vertebrae between the rib cage and the pelvis. They are the largest segments of the vertebral column and are characterized by the absence of the foramen transversarium within the transverse ...
of the vertebral column, in human anatomy * The fourth and last larval stage in the ''
Caenorhabditis elegans ''Caenorhabditis elegans'' () is a free-living transparent nematode about 1 mm in length that lives in temperate soil environments. It is the type species of its genus. The name is a blend of the Greek ''caeno-'' (recent), ''rhabditis'' (r ...
'' worm development


Other uses

* L4, a modern version of the
Bren light machine gun The Bren gun was a series of light machine guns (LMG) made by Britain in the 1930s and used in various roles until 1992. While best known for its role as the British and Commonwealth forces' primary infantry LMG in World War II, it was also used ...
in the British Army *
ISO/IEC 8859-4 ISO/IEC 8859-4:1998, ''Information technology — 8-bit single-byte coded graphic character sets — Part 4: Latin alphabet No. 4'', is part of the ISO/IEC 8859 series of ASCII-based standard character encodings, first edition published in 1988. I ...
(Latin-4), an 8-bit character encoding


See also

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L04 (disambiguation) L04 may refer to: *Holtville Airport's FAA identifier *ATC code L04 Immunosuppressants, a subgroup of the Anatomical Therapeutic Chemical Classification System See also *L4 (disambiguation) L4 or L-4 may refer to : Transportation * SP&S Class L- ...
*
Level 4 (disambiguation) Level 4 or Level Four or Level IV may refer to: Technology * Level 4, a level of automation in a self-driving car (see Autonomous car#Classification) *Level 4, the transport layer in the OSI model of computer communications Gradation *Level 4 Bio ...
*
4L (disambiguation) 4L or 4-L can refer to: *4L, another name for Renault 4 * 4L is the fourth and final year of a law student in Tanzania, Kenya and Uganda. *4L Trophy *Curtiss R-4L, model of Curtiss Model R *ORC4L *Proje 4L, see Proje4L / Elgiz Museum of Contempora ...
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