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What does NIIS stand for?

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Rank Abbr.Meaning
NIISNonimmigrant Information System (US Immigration and Naturalization Service)
NIISNational Institute of Industrial Safety (UK Independent Administrative Institution)
NiiSNorthshore International Insurance Services (Danvers, MA)
NIISNational Inhalants Information Service (Australia)

Note: We have 2 other definitions for NIIS in our Acronym Attic