L3, L03, L.3 or L-3 may refer to:
In arts and media
- Live, Loud & Local, a show launched by band The Matches in the Oakland, California region
- Leprechaun 3, a film
- L3-37, a droid in Solo: A Star Wars Story
- Lower third, in television and film a graphic overlay placed in the title-safe lower area of the screen.
Businesses
- L3 Technologies, a company that provided intelligence, surveillance, and reconnaissance systems prior to a merger with Harris Corporation to form L3Harris Technologies in 2019
- DHL De Guatemala (IATA code L3), a cargo airline based in Guatemala
- LTU Austria (IATA code L3), an airline based in Austria
In science and technology
Biology and medicine
- L3, the third lumbar vertebra, in human anatomy
- the third larval stage in the Caenorhabditis elegans worm development
- ATC code L03 Immunostimulants, a subgroup of the Anatomical Therapeutic Chemical Classification System
- Haplogroup L3 (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup generally found in East Africa
Computing and telecommunications
- L-3, an L-carrier cable system developed by AT&T
- L3 microkernel, a microkernel operating system by German computer scientist Jochen Liedtke
- The Level-3 CPU cache in a computer
- ISO/IEC 8859-3 (Latin-3), an 8-bit character encoding
- L3 technical support, the highest level dealing with the most difficult or advanced problems.
Transportation
Air- and spacecraft
- Aeronca L-3 Grasshopper, a light airplane used by the USAAF during World War II
- Avia L.3, an Italian plane used for training by the Regia Aeronautica
- Macchi L.3, a 1916 Italian biplane flying boats
- Soyuz 7K-L3, a crewed lunar lander design type in Russia's Soyuz space program
- N1/L3, the Soviet crewed lunar landing program
Other modes of transportation
- L3/33 and L3/35, Italian tankettes used in World War II
- L03, a Chevrolet Small-Block engine model
- Soviet submarine L-3, a 1931 Leninets class minelayer submarine
- SP&S Class L-3, an 1883 steam locomotives class
- L3 (New York City bus), a temporary bus route in New York City
- LNER Class L3, a class of British steam locomotives
- The Kingsford branch of the CBD and South East Light Rail in Sydney, Australia, is numbered L3
Other uses in science and technology
- L3, a form of low-alloy special purpose steel
- L3 (CERN), one of the four detectors of the Large Electron-Positron Collider
- L (length^3), volume
- The third Lagrange Point in a gravitational system
- Latitude/Longitude Locator, an STS-32 Space Shuttle mission experiment
See also
- 3L (disambiguation)
- LLL (disambiguation)
- Level 3 (disambiguation)
- L band, radio frequencies in the electromagnetic spectrum
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