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Ld

LD can mean:

• The laserdisc video format, which looks like a huge compact disc
• Learning-disabled
• Legislative district
• The Lilian day, a version of the Julian day,
• Lincoln-Douglas Debate, a form of debate.
• The logarithm of base 2, <math>\mathrm{ld}(x)=\log_2(x)<math>, from the Latin logarithmus dualis.
• Shorthand for long distance, as with a telephone call to or from another area
• Lucid dreaming, dreaming and being aware of it
• Lethal dose, indication for a dosage (of drugs, of radiation), that kills the specified percentage of test organisms.