# LD

LD may refer to:

## Arts and entertainment

* Lighting designer, a person in charge of lighting in theatre

### Film and television

* Lorraine "L.D." Delacorte, a character on the TV series Degrassi
* Larry David, sometimes referred to as L.D. on the television show Curb Your Enthusiasm
* Latin Disciples, a fictional gang in television series Day Break
* Living Dangerously, an Extreme Champion Wrestling pay-per-view event (ECW PPV)
* Low-definition television (LDTV)
* "-LD", a United States call sign suffix signifying a low-power digital television station
* LaserDisc or MCA Discovision is a 12 inch Analog Video optical disc

### Music

* Lil Dicky (born 1988), American rapper
* Little Doses, a Scottish alternative rock band
* Luis Dubuc (born 1985), American musician
* LD (rapper), British rapper
* Lemon Demon, American musical project and band

## Businesses and organizations

* Air Hong Kong (IATA code LD)
* Light Dragoons, a British Army cavalry regiment
* Línea Turística Aereotuy (IATA code LD)
* Louis Dreyfus Company, a French commodities trading firm

## Economics and finance
### Contract law

* Liability damages
* Liquidated damages

### Currencies

* Liberian dollar, the currency of Liberia
* Libyan dinar, the currency of Libya
* Liberty dollar (private currency), produced in the US

### Products

* LD (cigarette), a brand of cigarette

## Places

* LD postcode area, also known as the Llandrindod Wells postcode area, in Wales
* Lakshadweep, India (ISO 3166-2 code LD)
* County Longford, Ireland (code LD)

## Politics

* Liberal democracy, a form of government based on rule of the people (democracy) tempered by the rule of law and natural rights (liberalism)
* Lincoln–Douglas debate, a form of debate
* Liberal Democrats (UK), a UK political party
* Lord, a peer of the realm in the United Kingdom

## Science, technology, and mathematics
### Astronomy

* Lilian day, a variant of the Julian day
* Lunar distance (astronomy), the distance between the Earth and the Moon, used a general measure of distance

### Biology and medicine

* Lactate dehydrogenase, an enzyme in plants and animals
* Lateral dorsal nucleus of thalamus, an anatomic structure of the brain
* Learning disability, a condition that can impair learning through standard methods
* Lethal dose, an indication of the lethal toxicity of a given substance or type of radiation
* Licensed Dietitian
* Linkage disequilibrium, in genetics, when alleles occur together more often than they would by chance
* Lucid dreaming, a dream in which one is conscious of dreaming as it is happening

### Electronics and computing

* ld, an instruction on a Z80 CPU
* ld (Unix), the linker command on Unix and Unix-like systems
* Laser diode, semiconductor laser-emitting device
* LaserDisc, an obsolete optical disc video/data format and predecessor to DVD
* Levenshtein distance, a string metric for measuring the difference between two sequences.
* Line Dubbed, a term for unlicensed copies of films with an audio track, which has been ripped from the line out connection of a projector
* Linked data, a method of publishing structured data so that it can be interlinked and become more useful
* The 'Linked Document' in the NISO standard Content Profile/Linked Document, a data serialisation format
* Listening device, used in covert investigations

### Telecommunications

* Long-distance calling, a telephone call charged at a higher rate
* Loop Disconnect dialing

### Other

* (chemistry) D/L nomenclature, used in naming chemical compounds
* (linguistics) Language Development, the changes that take place in language, speech & communication in the context of children's development
* (manufacturing) Linz-Donawitz process, a widely-used process in Basic oxygen steelmaking
* (mathematics) Binary logarithm, $\mathrm {ld} (x)=\log _{2}(x)$, from the Latin logarithmus dualis
* (military) Laser designator, used by the military for targeting
* (physics) London dispersion force, weak intermolecular forces

## Other uses

* (communications) Lincoln–Douglas debate format
* (sociology) Long-distance relationship
* (sports) Line drive, in baseball
* (sports) Ludum Dare, a game development competition