LD

From Wikipedia, the free encyclopedia

LD can mean:

In science and mathematics:

• Lethal dose, the percentage of test organisms killed by a specific dosage (of drugs, radiation, etc.).
• The logarithm of base 2, ld(x) = log₂(x), from the Latin logarithmus dualis.
• Lunar distance, the distance between the Earth and the Moon and a measure of navigation.
• Linkage disequilibrium, when seemingly independent alleles have different rates of appearance (thanks to fitness concerns, etc.) in genetics.

In technology:

• Laserdisc format, an obsolete video/data format and predecessor to compact discs.
• ld (Unix), the linker command on Unix and Unix-like systems.
• Long distance, a telephone call to another area sufficiently far away to be charged at a higher rate.
• Linkdead, shorthand for "disconnected from the server" in some online activities and games.
• ld, an instruction on a Z80 CPU.

In politics:

• Liberal democracy, a form of government based on rule of the people (democracy) tempered by the rule of law and natural rights (liberalism).
• Legislative district, a division of voters into a district.

In television:

• Lorraine "L.D." Delacorte, a character from the Degrassi series played by Amanda Cook.
• Larry David, sometimes referred to as L.D. in the television show Curb Your Enthusiasm.

LD can also refer to:

• Lincoln-Douglas debate, a form of debate.
• Learning disability, a condition that can impair learning through standard methods
• Lilian day, a variant of the Julian day.
• Lucid dreaming, techniques for remebering and controlling dreams.
• Lighting designer, the person in charge of lighting in theatre.
• Air Hong Kong and Linea Turistica Aerotuy, airlines with IATA code LD.