GSC
GSC (or grams per square centimeter) was a unit of measure for pressure, equal to 0.001 KSC or roughly 1 millibar.

 Apollo's hand was capable of creating over 1,000 GSC of external pressure on the hull of the . Above 1,000 GSC, and the systems aboard a  start to become critical. ()

 A Klingon  warship was capable of withstanding atmospheric pressure of 15,000 GSC, or that found in a Class 9 gas giant approximately 2 kilometers in its atmosphere. That pressure was also well within the tolerance of a 22nd century Earth Starfleet . ()

  starships were capable of withstanding a hull pressure exceeding 9,000,000 GSC. ()

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Measurements
Abbreviations