Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym NIG is...

NIG is

Not In Guild
Naturally Intelligent Gentleman
Not In Group

More Meanings For NIG:

Not In Guild
Naturally Intelligent Gentleman
Not In Group
National Institute of Genetics Genetic Resources Laboratory (Shigen-Japan)
Nunavut Investment Group
Nikunau, Republic of Kiribati
Nigeria

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