Computers and technology

• Second-level domain
  Second-level domain
  In the Domain Name System hierarchy, a second-level domain is a domain that is directly below a top-level domain . For example, in example.com, example is the second-level domain of the .com TLD....
  
  , an Internet domain directly beneath the top-level domain
• Simple learning design 2.0
  Simple learning design 2.0
  Simple Learning Design 2.0 is a learning design specification proposed by Durand and Downes from the National Research Council of Canada in 2009.SLD 2.0 is designed to be easily implemented by developers in a commercial e-learning application....
  
  , a specification used to express learning activities
• Semiconductor laser diode, a laser diode
  Laser diode
  The laser diode is a laser where the active medium is a semiconductor similar to that found in a light-emitting diode. The most common type of laser diode is formed from a p-n junction and powered by injected electric current...
  
   based on a semiconductor
• SLD resolution
  SLD resolution
  SLD resolution is the basic inference rule used in logic programming. It is a refinement of resolution, which is both sound and refutation complete for Horn clauses.-The SLD inference rule:...
  
  , the basic inference rule used in logic programming
• Stanford Large Detector (1992–1998), the main detector for the Stanford Linear Collider
• Superluminescent diode
  Superluminescent diode
  A superluminescent diode is an edge-emitting semiconductor light source based on superluminescence. It combines the high power and brightness of laser diodes with the low coherence of conventional light-emitting diodes. Its emission band is 5–100 nm wide.- History :In 1986 Dr. Gerard A...
  
  , a light source

Graphics

• Single-line diagram, a simplified power system schematic
• Straight-line diagram
  Straight-line diagram
  A straight-line diagram is a diagram of a road where the road is shown as a straight line. Such diagrams are usually produced by a highway department, and display features along the road, including bridges and intersecting roads...
  
  , a diagram of a road where the road is shown as a straight line
• Styled Layer Descriptor
  Styled Layer Descriptor
  A Styled Layer Descriptor is an XML schema specified by the Open Geospatial Consortium for describing the appearance of map layers. It is capable of describing the rendering of vector and raster data...
  
  , a technical specification for describing the appearance of a map layers

Politics and law

• Scottish Liberal Democrats
  Scottish Liberal Democrats
  The Scottish Liberal Democrats are one of the three state parties within the federal Liberal Democrats; the others being the Welsh Liberal Democrats and the Liberal Democrats in England...
  
  , a political party in Scotland
• Social and Liberal Democrats (1988), a former name of the Liberal Democrats party in Great Britain
• Sojusz Lewicy Demokratycznej, a political party in Poland
• Statute law database, a directory of laws in force in a given jurisdiction

Other

• Single Lens Digital, a type of mirrorless interchangeable-lens camera
• SLD glass, a type of glass with low dispersion
• Specific learning disability
  Learning disability
  Learning disability is a classification including several disorders in which a person has difficulty learning in a typical manner, usually caused by an unknown factor or factors...
  
  , disorders of learning and cognition that are intrinsic an individual
• Supercooled Large Droplet, a type of atmospheric icing condition
• Sutherland railway station (Australia station code SLD), on the Illawarra Line, suburb of Sydney Sutherland
• The Southland Region
  Southland Region
  Southland is New Zealand's southernmost region and is also a district within that region. It consists mainly of the southwestern portion of the South Island and Stewart Island / Rakiura...
  
  of New Zealand