L4

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L4, L04 or L-4 may refer to :

• L4 microkernel family
• ATC code L04 Immunosuppressants, a subgroup of the Anatomical Therapeutic Chemical Classification System
• Haplogroup L4 (mtDNA), a human mitochondrial DNA haplogroup
• HMS L4, a 1918 British L class submarine
• Lawson L-4, a 1924 American unflown biplane airliner
• Liberty L-4, a World War I 4-cylinder, water-cooled, inline, aero-engine
• Ribosomal protein L4, a human gene
• SP&S Class L-4, a 1884 steam locomotives class
• USS L-4 (SS-43), a 1915 United States Navy L-class submarine
• The L^p space for p=4.

others 

• L-4, one of the U.S. military designations for the Piper Cub in World War II
• L4, a modern version of the Bren light machine gun actually in service in the British Army
• L-4, the fourth iteration of L-carrier, high capacity frequency division multiplex over coaxial cable used by the Bell System
• the fourth Lagrange Point in an astronomical orbital configuration
• the fourth lumbar vertebra of the vertebral column, in human anatomy
• a straight-4 engine
• Denver, Colorado based Lynx Aviation IATA code
• Leprechaun 4: In Space, a film

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