What does PSST mean in NASA?

This page is about the meanings of the acronym/abbreviation/shorthand PSST in the Governmental field in general and in the NASA terminology in particular.

Periodic Significant Scheduled Task

Governmental » NASA

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Definition

What does PSST mean?

psst(Interjection)
Implies that the speaker is sending secret or whispered information to another person.

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"PSST." Abbreviations.com. STANDS4 LLC, 2015. Web. 4 Sep. 2015. <http://www.abbreviations.com/term/566249>.