noun: Abbreviation of supplementary policy statement.
noun: (aviation) Initialism of stall protection/prevention system.
noun: (pathology) Abbreviation of stiff person syndrome. [(medicine) A rare neurological disorder characterized by progressive rigidity and stiffness, primarily of the axial musculature, resulting in postural deformities.]
noun: (electricity) Initialism of supplementary power system/supply.
noun: (electricity) Initialism of standby power system/supply.
noun: (electricity) Initialism of smart power system/supply.
noun: (electricity) Initialism of stand-alone power system/supply.
noun: Initialism of standalone photovoltaic system/supply.
noun: (electricity) Initialism of solar power station.
noun: (aerospace) Initialism of solar power satellite.
noun: (aerospace) Initialism of satellite power system.
noun: (psychology) Initialism of sensory processing sensitivity. [(psychology) a temperamental or personality trait involving an increased sensitivity of the central nervous system and a deeper cognitive processing of physical, social and emotional stimuli]
noun: (US, aerospace, astronautics) Initialism of Service Propulsion System.
