There are 2 definitions of Ni in English:

Ni1

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symbol

The chemical element nickel.

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Word of the day crowdsource
Pronunciation: ˈkraʊdsɔːs
verb
obtain (information) by enlisting help of many people…

There are 2 definitions of Ni in English:

NI2

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abbreviation

1(In the UK) National Insurance.
1.1Northern Ireland.
1.2(In New Zealand) the North Island.