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 (wrestling series), 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, the distance between the Earth and the Moon, used as 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

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, <math>\mathrm{ld}(x)=\log_2(x)</math>, from the Latin logarithmus dualis
  • (military) Laser designator, used by the military for targeting
  • (physics) London dispersion force, weak intermolecular forces
  • (statistics) Listwise deletion, a method of handling missing data

Other uses

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

See also

  • eLDee, Nigerian rapper and record producer
  • 1D (disambiguation), similar in glyphic structure to "lD"/"ld"(1d)
  • ID (disambiguation), similar in glyphic structure to "lD"/"ld"(Id)
  • Ladder diagram (disambiguation), various meanings