Symbols:I

Roman Numerals

 * $\mathrm I$ or $\mathrm i$

The Roman numeral for $1$.

Imaginary Part

 * $\Im \left({z}\right)$ or $\operatorname{Im} \left({z}\right)$

The imaginary part of a complex number $z$.

Variants
Variants of $\operatorname{Im} \left({z}\right)$ and $\Im \left({z}\right)$ that can often be found are:


 * $\operatorname{\mathscr I} \left({z}\right)$
 * $\operatorname{im} \left({z}\right)$

Image

 * $\operatorname{Im}$

Denotes the image of a relation or the image of a mapping.