What does U/O stand for?

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

We've found a total of 2 definitions for U/O:

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Under Observation for ....

Medical » Physiology

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Used on

Governmental » NASA

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"U/O." Abbreviations.com. STANDS4 LLC, 2015. Web. 13 Oct. 2015. <http://www.abbreviations.comserp.php?st=U%2FO>.