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==Science and technology== * [[Sun protection factor]], of sunscreen * [[Specific-pathogen-free]], laboratory animals known to be without pathogens * [[Superplastic forming]], of sheet metal * [[Space Power Facility]], a NASA test facility * [[S-phase-promoting factor]], in biology * [[Formal spectrum of a ring]], a construction in algebraic geometry * [[building insulation materials#Spray polyurethane foam (SPF)|Spray polyurethane foam]], a building insulation material * [[Spruce-pine-fir]], mixed softwood timber * [[Spot 42 RNA]], a small regulatory RNA found in some Gammaproteobacteria ===Computing=== * [[Sender Policy Framework]], for email authentication * [[Shortest Path First]], or Dijkstra's algorithm * IBM [[ISPF | Structured Programming Facility]], later ISPF
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