SPF may refer to: 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 Spray polyurethane foam, a building insulation material Spruce-pine-fir, mixed softwood timber Computing Sender Policy Framework, for email authentication Shortest Path First, or Dijkstra's algorithm IBM Structured Programming Facility, later ISPF Organizations , the oldest poetry society in France , the Argentine Federal Penitentiary Service (Conspiracy of Fire Nuclei), Greek terrorist organization Police Scottish Police Federation Singapore Police Force Somali Police Force Special Police Force, a unit within a police force Economics Survey of Professional Forecasters, US macroeconomic forecasts survey ECB Survey of Professional Forecasters, macroeconomic forecasts Other uses Security Policy Framework, UK Social protection floor Annual Summer Play Festival, New York City, US Black Hills Airport (IATA airport code), South Dakota, US Sherwood Park Freeway, Edmonton, Alberta, Canada Springfield railway station, station code See also Single point of failure (SPOF) Socialist Party of Florida (SPFL)