L4

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
• Liberty L-4, a World War I four-cylinder, water-cooled, inline, aero-engine
• L-4, one of the U.S. military designations for the Piper Cub in World War II
• L4, an inline-four engine
• L4, IATA code for Lynx Aviation (United States)

Science

• L4 microkernel family, a family of operating system kernels
• Haplogroup L4 (mtDNA), a human mitochondrial DNA haplogroup
• Ribosomal protein L4, a human gene
• L4, the fourth Lagrange Point in an astronomical orbital configuration
• L4, a lumbar vertebra of the vertebral column, in human anatomy
• L-4, the fourth iteration of L-carrier, high capacity frequency division multiplex over coaxial cable used by the Bell System
• The L^p space for p=4

Other uses

• L4, a modern version of the Bren light machine gun in the British Army
• Leprechaun 4: In Space, a film

See also

• L04 (disambiguation)