What does NIOS stand for?

abbreviation to define

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Possible Meanings	Rank
Northern Illinois Operation Snowball	**
NetWare I O Subsystem	**
Nederlands Instituut Opleiding Sportartsen	**
National Institute for Open School	**
National Institute for Occupational Safety	*
Netherlands Institute of Ocean Sciences	*

Note: Acronym Finder has 1 verified definitions for NIOS