SPF

SPF can stand for:
 * Sender Policy Framework, an e-mail anti-forgery system
 * Shortest Path First, another name for Dijkstra's algorithm
 * Singapore Police Force
 * Single point of failure in systems
 * South Pacific Forum
 * Space Power Facility, an experimental vacuum chamber for NASA
 * Special Forces, highly trained and advanced soldiers
 * Mixed softwood timber coming from Spruce, Pine and Fir trees
 * Specific Pathogen Free, a term for laboratory animals known to be without pathogens
 * Socialist Party of Florida, an affiliate of the Socialist Party USA
 * Summer Play Festival
 * Sun Protection Factor, a laboratory measure of the effectiveness of sunscreen
 * Sunbelt Personal Firewall, a desktop personal firewall
 * Superplastic Forming
 * System Productivity Facility, an early version of the ISPF text editor
 * Servicio Penitenciario Federal, the Argentine federal administration in charge of prisons.

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