What does GSIU stand for?

What does GSIU mean? This page is about the various possible meanings of the acronym, abbreviation, shorthand or slang term: GSIU.

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Ground Standard Interface Unit

Governmental » NASA

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"GSIU." Abbreviations.com. STANDS4 LLC, 2016. Web. 26 Sep. 2016. <http://www.abbreviations.com/GSIU>.