// Workers AI · dad joke modeWhat did SPF say to the sun? You're blocked.

SPF may refer to:

Science and technology

• Sun protection factor, of sunscreen
• Space Power Facility, a NASA test facility

Biology

• Specific-pathogen-free, laboratory animals known to be without pathogens
• S-phase-promoting factor, in biology
• Spot 42 RNA, a small regulatory RNA found in some Gammaproteobacteria

Computing and mathematics

• Sender Policy Framework, for email authentication
• IBM Structured Programming Facility, later ISPF
• Shortest Path First, or Dijkstra's algorithm
• Formal spectrum of a ring, a construction in algebraic geometry

Materials

• Superplastic forming, of sheet metal
• Spray polyurethane foam, a building insulation material
• Spruce-pine-fir, mixed softwood timber

Government

• Social protection floor
• Security Policy Framework, UK
• Servicio Penitenciario Federal, the Argentine Federal Penitentiary Service
• Scottish Police Federation, represents Scottish police officers
• 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

Transportation

• Black Hills Airport (IATA airport code), South Dakota, US
• Sherwood Park Freeway, Edmonton, Alberta, Canada
• Springfield railway station (Scotland), station code

Other uses

• Annual Summer Play Festival, New York City, US
• Société des poètes français, the oldest poetry society in France
• Synomosía Pyrínon tis Fotiás (Conspiracy of Fire Nuclei), Greek terrorist organization

See also

• Single point of failure (SPOF)
• Socialist Party of Florida (SPFL)