L4 or L-4 may refer to :
Transportation
*
SP&S Class L-4, 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, 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 piston engine where cylinders are arranged in a line along a common crankshaft.
The vast majority of automotive four-cylinder engines use a straight-four layout (with the ...
(L4), a type of inline internal combustion four cylinder engine
**
Liberty L-4, 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, speci ...
(IATA code)
*
L4 (New York City bus), a temporary bus route in New York City
*
Chaika L-4, a Russian twin-engined amphibious aircraft
*
Soviet submarine L-4
Science and technology
*
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 microkernel ...
, 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 an astronomical orbital configuration
* L
4, 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 develo ...
, high capacity frequency division multiplex over coaxial cable used by the Bell System
Biology
*
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 ...
, a human mitochondrial DNA haplogroup
*
Ribosomal protein L4, 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'' 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 (Latin-4), an 8-bit character encoding
See also
*
L04 (disambiguation)
*
Level 4 (disambiguation)
*
4L (disambiguation)
{{Letter-NumberCombDisambig
