SLD

SLD may refer to:

==Computers and technology== Second-level domain, an Internet domain directly beneath the top-level domain Simple learning design 2.0, a specification used to express learning activities SLD resolution, the basic inference rule used in logic programming Stanford Large Detector (1992–1998), for the Stanford Linear Collider Superluminescent diode, a light source Soft laser desorption, a laser desorption of large molecules that results in ionization without fragmentation