What does GRIN mean in NASA?

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

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What does GRIN mean?

smile, smiling, grin, grinning(verb)
a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement

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"GRIN." Abbreviations.com. STANDS4 LLC, 2015. Web. 8 Oct. 2015. <http://www.abbreviations.com/term/247088>.