plural of SP

Abbreviation of supplementary policy statement. / (aviation) Initialism of stall protection/prevention system. / (pathology) Abbreviation of stiff person syndrome.

(US, aerospace, astronautics) Initialism of Service Propulsion System.

(horse racing, chiefly Australia) Starting price. / Selling price / (US, military, navy) Shore patrol / (law enforcement) state police / Slow play / (computing) service pack

Initialism of São Paulo, A state of Brazil.

Abbreviation of spelling. (often used when correcting or questioning one's own spelling) / Abbreviation of spur. (in highway designations and signage) / Abbreviation of special.

(proofreading) Abbreviation of spell out.

Spanish (language) / September

Abbreviation of specific gravity.

Initialism of scale payment sub office. Sub-sorting post office.