-i may be:
* A
demonymic (''nisba'') suffix in Arabic
* A
demonymic suffix in English
* A
pronominal suffix in Hebrew
* The negative
imaginary unit
The imaginary unit or unit imaginary number () is a mathematical constant that is a solution to the quadratic equation Although there is no real number with this property, can be used to extend the real numbers to what are called complex num ...
(), a square root of
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