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Definitions of psc:
noun: (astronomy, obsolete) Abbreviation of parsec.
noun: (geometry) Abbreviation of parallax second. [A unit of length, used in astronomy, defined as the distance from the Earth of an object that exhibits a parallax of 1 arcsecond. It is approximately equal to 3.08568025 × 10¹³ kilometers or 3.2616 light years.]
noun: Initialism of Palestine Solidarity Campaign.
noun: Initialism of Putonghua Proficiency Test, standardized test of Standard Mandarin Chinese proficiency for native speakers