LR

LR or Lr may refer to:

Codes

Lr, the symbol for Lawrencium in the periodic table of elements
Latus rectum, a line segment parallel to the directrix through the focus of a conic section
L(R) (pronounced L of R) in set theory

LR(k) (Left-to-right, Rightmost-derivation with k symbols of lookahead), a type of parser for deterministic context-free grammars
Lexical resource, a database consisting of one or several dictionaries
Lactated Ringer's solution, an intravenous fluid
Lightning rod, a device used to divert and ground lightning
Link register, a special purpose register that holds the address to return to when a function call completes on many instruction set architectures
.22 Long Rifle, a type of rimfire cartridge ammunition
Adobe Photoshop Lightroom, photography software program

The Lord of the Rings, a novel by J. R. R. Tolkien and its subsequent adaptations
The Lost Road and Other Writings, part of The History of Middle-earth book series by Christopher Tolkien
Logan's Run, 1967 novel that has spawned multiple adaptations and sequels in literature, film, television, and comic books
Late Registration, rapper/producer Kanye West's second album

Land Rover, a British car manufacturer
Lloyd's Register, a maritime classification society and independent risk management organisation
Adobe Photoshop Lightroom, photo editing software
Lego Racers, a product line (or theme) of the construction toy Lego
Line Rider, an internet physics toy

La Ronde, a amusement park in Montreal, Canada
Legislative route, In United States, a highway defined by laws passed in a state legislature
Live rock, rock from the ocean that has been introduced into a saltwater aquarium